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James Watt (; 30 January 1736 (19 January 1736 OS) – 25 August 1819) was a Scottish inventor, mechanical engineer, and
chemist A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties. Chemists carefully describe th ...
who improved on Thomas Newcomen's 1712
Newcomen steam engine The atmospheric engine was invented by Thomas Newcomen in 1712, and is often referred to as the Newcomen fire engine (see below) or simply as a Newcomen engine. The engine was operated by condensing steam drawn into the cylinder, thereby creat ...
with his
Watt steam engine The Watt steam engine design became synonymous with steam engines, and it was many years before significantly new designs began to replace the basic Watt design. The first steam engines, introduced by Thomas Newcomen in 1712, were of the "a ...
in 1776, which was fundamental to the changes brought by the
Industrial Revolution The Industrial Revolution was the transition to new manufacturing processes in Great Britain, continental Europe, and the United States, that occurred during the period from around 1760 to about 1820–1840. This transition included going f ...
in both his native Great Britain and the rest of the world. While working as an instrument maker at the
University of Glasgow , image = UofG Coat of Arms.png , image_size = 150px , caption = Coat of arms Flag , latin_name = Universitas Glasguensis , motto = la, Via, Veritas, Vita , ...
, Watt became interested in the technology of
steam engine A steam engine is a heat engine that performs mechanical work using steam as its working fluid. The steam engine uses the force produced by steam pressure to push a piston back and forth inside a cylinder. This pushing force can be ...
s. He realised that contemporary engine designs wasted a great deal of energy by repeatedly cooling and reheating the
cylinder A cylinder (from ) has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base. A cylinder may also be defined as an ...
. Watt introduced a design enhancement, the separate condenser, which avoided this waste of energy and radically improved the power, efficiency, and cost-effectiveness of steam engines. Eventually, he adapted his engine to produce rotary motion, greatly broadening its use beyond pumping water. Watt attempted to commercialise his invention, but experienced great financial difficulties until he entered a partnership with
Matthew Boulton Matthew Boulton (; 3 September 172817 August 1809) was an English manufacturer and business partner of Scottish engineer James Watt. In the final quarter of the 18th century, the partnership installed hundreds of Boulton & Watt steam engin ...
in 1775. The new firm of
Boulton and Watt Boulton & Watt was an early British engineering and manufacturing firm in the business of designing and making marine and stationary steam engines. Founded in the English West Midlands around Birmingham in 1775 as a partnership between the Eng ...
was eventually highly successful and Watt became a wealthy man. In his retirement, Watt continued to develop new inventions though none was as significant as his steam engine work. As Watt developed the concept of
horsepower Horsepower (hp) is a unit of measurement of power, or the rate at which work is done, usually in reference to the output of engines or motors. There are many different standards and types of horsepower. Two common definitions used today are t ...
, the SI unit of power, the
watt The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3. It is used to quantify the rate of energy transfer. The watt is named after James ...
, was named after him.


Biography


Early life and education

James Watt was born on 19 January 1736 in Greenock, Renfrewshire, the eldest of the five surviving children of Agnes Muirhead (1703–1755) and James Watt (1698–1782). His mother came from a distinguished family, was well educated and said to be of forceful character, while his father was a shipwright, ship owner and contractor, and served as the Greenock's chief baillie in 1751. The Watt family's wealth came in part from Watt's father's trading in slaves and slave-produced goods. Watt's parents were
Presbyterian Presbyterianism is a part of the Reformed tradition within Protestantism that broke from the Roman Catholic Church in Scotland by John Knox, who was a priest at St. Giles Cathedral (Church of Scotland). Presbyterian churches derive their n ...
s and strong Covenanters, but despite his religious upbringing he later became a deist. Watt's grandfather, Thomas Watt (1642–1734), was a teacher of mathematics, surveying and navigation and baillie to the Baron of Cartsburn. Initially, Watt was educated at home by his mother, later going on to attend Greenock Grammar School. There he exhibited an aptitude for
mathematics Mathematics is an area of knowledge that includes the topics of numbers, formulas and related structures, shapes and the spaces in which they are contained, and quantities and their changes. These topics are represented in modern mathematics ...
, while
Latin Latin (, or , ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through ...
and Greek failed to interest him. Watt is said to have suffered prolonged bouts of ill-health as a child and from frequent headaches all his life. After leaving school, Watt worked in the workshops of his father's businesses, demonstrating considerable dexterity and skill in creating engineering models. After his father suffered unsuccessful business ventures, Watt left Greenock to seek employment in
Glasgow Glasgow ( ; sco, Glesca or ; gd, Glaschu ) is the most populous city in Scotland and the fourth-most populous city in the United Kingdom, as well as being the 27th largest city by population in Europe. In 2020, it had an estimated popu ...
as a mathematical instrument maker. When he was 18, Watt's mother died and his father's health began to fail. Watt travelled to
London London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary dow ...
and was able to obtain a period of training as an instrument maker for a year (1755–56), then returned to Scotland, settling in the major commercial city of
Glasgow Glasgow ( ; sco, Glesca or ; gd, Glaschu ) is the most populous city in Scotland and the fourth-most populous city in the United Kingdom, as well as being the 27th largest city by population in Europe. In 2020, it had an estimated popu ...
, intent on setting up his own instrument-making business. He was still very young and, having not had a full
apprenticeship Apprenticeship is a system for training a new generation of practitioners of a trade or profession with on-the-job training and often some accompanying study (classroom work and reading). Apprenticeships can also enable practitioners to gain a ...
, did not have the usual connections via a former master to establish himself as a journeyman instrument maker. Watt was saved from this impasse by the arrival from Jamaica of astronomical instruments bequeathed by Alexander MacFarlane to the
University of Glasgow , image = UofG Coat of Arms.png , image_size = 150px , caption = Coat of arms Flag , latin_name = Universitas Glasguensis , motto = la, Via, Veritas, Vita , ...
- instruments that required expert attention. Watt restored them to working order and was remunerated. These instruments were eventually installed in the
Macfarlane Observatory The Macfarlane Observatory was established at the University of Glasgow in 1757. It was the first purpose-built university observatory in Britain. History The Observatory was named after Alexander MacFarlane, a merchant and slave-owner in Ki ...
. Subsequently, three professors offered him the opportunity to set up a small workshop within the university. It was initiated in 1757 and two of the professors, the
physicist A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate cau ...
and
chemist A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties. Chemists carefully describe th ...
Joseph Black as well as the famed economist Adam Smith, became Watt's friends. At first, he worked on maintaining and repairing scientific instruments used in the university, helping with demonstrations, and expanding the production of quadrants. He made and repaired brass reflecting quadrants, parallel rulers,
scales Scale or scales may refer to: Mathematics * Scale (descriptive set theory), an object defined on a set of points * Scale (ratio), the ratio of a linear dimension of a model to the corresponding dimension of the original * Scale factor, a number w ...
, parts for
telescope A telescope is a device used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. Originally meaning only an optical instrument using lenses, curved mirrors, or a combination of both to obse ...
s, and barometers, among other things. It is sometimes falsely stated that he struggled to establish himself in Glasgow due to opposition from the
Trades House Trade is the voluntary exchange of goods, services, or both. Trade or trading may also refer to: Geography * Trade, Tennessee, an unincorporated community, United States * Trade City, Pennsylvania, an unincorporated community, United States * ...
, but this myth has been thoroughly debunked by the historian Harry Lumsden. The records from this period are lost, but it is known that he was able to work and trade completely normally as a skilled metal worker so the
Incorporation of Hammermen Incorporation may refer to: * Incorporation (business), the creation of a corporation * Incorporation of a place, creation of municipal corporation such as a city or county * Incorporation (academic), awarding a degree based on the student having ...
must have been satisfied that he met their requirements for membership. It is also known that other people in the metal trades were pursued for working without being members of the Incorporation well into the 19th century, so the rules were definitely being enforced when Watt was trading freely throughout the city. In 1759, he formed a partnership with John Craig, an architect and businessman, to manufacture and sell a line of products including musical instruments and toys. This partnership lasted for the next six years, and employed up to 16 workers. Craig died in 1765. One employee, Alex Gardner, eventually took over the business, which lasted into the 20th century. In 1764, Watt married his cousin Margaret (Peggy) Miller, with whom he had 5 children, 2 of whom lived to adulthood: James Jr. (1769–1848) and Margaret (1767–1796). His wife died in childbirth in 1773. In 1777, he married again, to Ann MacGregor, daughter of a Glasgow
dye A dye is a colored substance that chemically bonds to the substrate to which it is being applied. This distinguishes dyes from pigments which do not chemically bind to the material they color. Dye is generally applied in an aqueous solution and ...
-maker, with whom he had 2 children: Gregory (1777–1804), who became a geologist and mineralogist, and Janet (1779–1794). Ann died in 1832. Between 1777 and 1790 he lived in Regent Place,
Birmingham Birmingham ( ) is a city and metropolitan borough in the metropolitan county of West Midlands in England. It is the second-largest city in the United Kingdom with a population of 1.145 million in the city proper, 2.92 million in the We ...
.


Watt and the kettle

There is a popular story that Watt was inspired to invent the steam engine by seeing a kettle boiling, the steam forcing the lid to rise and thus showing Watt the power of steam. This story is told in many forms; in some Watt is a young lad, in others he is older, sometimes it's his mother's kettle, sometimes his aunt's. Watt did not actually ''invent'' the steam engine, as the story implies, but dramatically improved the efficiency of the existing Newcomen engine by adding a separate condenser. This is difficult to explain to someone not familiar with concepts of heat and thermal efficiency. It appears that the story was created, possibly by Watt's son James Watt Jr., and persists because it is easy for children to understand and remember. In this light, it can be seen as akin to the story of Isaac Newton and the falling apple and his discovery of
gravity In physics, gravity () is a fundamental interaction which causes mutual attraction between all things with mass or energy. Gravity is, by far, the weakest of the four fundamental interactions, approximately 1038 times weaker than the stro ...
. Although it is often dismissed as a myth, the story of Watt and the kettle has a basis in fact. In trying to understand the
thermodynamics Thermodynamics is a branch of physics that deals with heat, work, and temperature, and their relation to energy, entropy, and the physical properties of matter and radiation. The behavior of these quantities is governed by the four laws ...
of heat and steam, James Watt carried out many laboratory experiments and his diaries record that in conducting these, he used a kettle as a
boiler A boiler is a closed vessel in which fluid (generally water) is heated. The fluid does not necessarily boil. The heated or vaporized fluid exits the boiler for use in various processes or heating applications, including water heating, central ...
to generate steam.


Early experiments with steam

In 1759, Watt's friend, John Robison, called his attention to the use of steam as a source of motive power. The design of the Newcomen engine, in use for almost 50 years for pumping water from mines, had hardly changed from its first implementation. Watt began to experiment with steam, though he had never seen an operating steam engine. He tried constructing a model; it failed to work satisfactorily, but he continued his experiments and began to read everything he could about the subject. He came to realise the importance of latent heat—the thermal energy released or absorbed during a constant-temperature process—in understanding the engine, which, unknown to Watt, his friend Joseph Black had previously discovered years before. Understanding of the steam engine was in a very primitive state, for the science of
thermodynamics Thermodynamics is a branch of physics that deals with heat, work, and temperature, and their relation to energy, entropy, and the physical properties of matter and radiation. The behavior of these quantities is governed by the four laws ...
would not be formalised for nearly another 100 years. In 1763, Watt was asked to repair a model Newcomen engine belonging to the university. Even after repair, the engine barely worked. After much experimentation, Watt demonstrated that about 3/4 of the thermal energy of the steam was being consumed in heating the engine cylinder on every cycle. This energy was wasted because, later in the cycle, cold water was injected into the cylinder to condense the steam to reduce its pressure. Thus, by repeatedly heating and cooling the cylinder, the engine wasted most of its thermal energy rather than converting it into mechanical energy. Watt's critical insight, arrived at in May 1765 as he crossed Glasgow Green park, was to cause the steam to condense in a separate chamber apart from the piston, and to maintain the temperature of the cylinder at the same temperature as the injected steam by surrounding it with a "steam jacket". Thus, very little energy was absorbed by the cylinder on each cycle, making more available to perform useful work. Watt had a working model later that same year. Despite a potentially workable design, there were still substantial difficulties in constructing a full-scale engine. This required more
capital Capital may refer to: Common uses * Capital city, a municipality of primary status ** List of national capital cities * Capital letter, an upper-case letter Economics and social sciences * Capital (economics), the durable produced goods used fo ...
, some of which came from Black. More substantial backing came from John Roebuck, the founder of the celebrated
Carron Iron Works The Carron Company was an ironworks established in 1759 on the banks of the River Carron near Falkirk, in Stirlingshire, Scotland. After initial problems, the company was at the forefront of the Industrial Revolution in the United Kingdom. Th ...
near Falkirk, with whom he now formed a partnership. Roebuck lived at Kinneil House in Bo'ness, during which time Watt worked at perfecting his steam engine in a cottage adjacent to the house. The shell of the cottage, and a very large part of one of his projects, still exist to the rear. The principal difficulty was in machining the piston and cylinder.
Iron Iron () is a chemical element with symbol Fe (from la, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in ...
workers of the day were more like
blacksmith A blacksmith is a metalsmith who creates objects primarily from wrought iron or steel, but sometimes from other metals, by forging the metal, using tools to hammer, bend, and cut (cf. tinsmith). Blacksmiths produce objects such as gates, gr ...
s than modern machinists, and were unable to produce the components with sufficient precision. Much capital was spent in pursuing a
patent A patent is a type of intellectual property that gives its owner the legal right to exclude others from making, using, or selling an invention for a limited period of time in exchange for publishing an enabling disclosure of the invention."A ...
on Watt's invention. Strapped for resources, Watt was forced to take up employment—first as a surveyor, then as a civil engineer—for 8 years. Roebuck went bankrupt, and
Matthew Boulton Matthew Boulton (; 3 September 172817 August 1809) was an English manufacturer and business partner of Scottish engineer James Watt. In the final quarter of the 18th century, the partnership installed hundreds of Boulton & Watt steam engin ...
, who owned the
Soho Manufactory The Soho Manufactory () was an early factory which pioneered mass production on the assembly line principle, in Soho, Birmingham, England, at the beginning of the Industrial Revolution. It operated from 1766–1848 and was demolished in 1853. B ...
works near
Birmingham Birmingham ( ) is a city and metropolitan borough in the metropolitan county of West Midlands in England. It is the second-largest city in the United Kingdom with a population of 1.145 million in the city proper, 2.92 million in the We ...
, acquired his patent rights. An
extension Extension, extend or extended may refer to: Mathematics Logic or set theory * Axiom of extensionality * Extensible cardinal * Extension (model theory) * Extension (predicate logic), the set of tuples of values that satisfy the predicate * Ext ...
of the patent to 1800 was successfully obtained in 1775. Through Boulton, Watt finally had access to some of the best iron workers in the world. The difficulty of the manufacture of a large cylinder with a tightly fitting piston was solved by John Wilkinson, who had developed precision boring techniques for
cannon A cannon is a large- caliber gun classified as a type of artillery, which usually launches a projectile using explosive chemical propellant. Gunpowder ("black powder") was the primary propellant before the invention of smokeless powder ...
making at Bersham, near
Wrexham Wrexham ( ; cy, Wrecsam; ) is a city and the administrative centre of Wrexham County Borough in Wales. It is located between the Welsh mountains and the lower Dee Valley, near the border with Cheshire in England. Historically in the count ...
,
North Wales North Wales ( cy, Gogledd Cymru) is a regions of Wales, region of Wales, encompassing its northernmost areas. It borders Mid Wales to the south, England to the east, and the Irish Sea to the north and west. The area is highly mountainous and rural, ...
. Watt and Boulton formed a hugely successful partnership,
Boulton and Watt Boulton & Watt was an early British engineering and manufacturing firm in the business of designing and making marine and stationary steam engines. Founded in the English West Midlands around Birmingham in 1775 as a partnership between the Eng ...
, which lasted for the next 25 years.


First engines

In 1776, the first engines were installed and working in commercial enterprises. These first engines were used to power pumps and produced only reciprocating motion to move the pump rods at the bottom of the shaft. The design was commercially successful, and for the next 5 years, Watt was very busy installing more engines, mostly in
Cornwall Cornwall (; kw, Kernow ) is a Historic counties of England, historic county and Ceremonial counties of England, ceremonial county in South West England. It is recognised as one of the Celtic nations, and is the homeland of the Cornish people ...
, for pumping water out of mines. These early engines were not manufactured by Boulton and Watt, but were made by others according to drawings made by Watt, who served in the role of
consulting engineer Engineers, as practitioners of engineering, are professionals who Invention, invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considerin ...
. The erection of the engine and its shakedown was supervised by Watt, at first, and then by men in the firm's employ. These were large machines. The first, for example, had a cylinder with a diameter of 50 inches and an overall height of about 24 feet, and required the construction of a dedicated building to house it. Boulton and Watt charged an annual payment, equal to 1/3 of the value of the coal saved in comparison to a Newcomen engine performing the same work. The field of application for the invention was greatly widened when Boulton urged Watt to convert the reciprocating motion of the piston to produce rotational power for grinding, weaving and milling. Although a crank seemed the obvious solution to the conversion, Watt and Boulton were stymied by a patent for this, whose holder, James Pickard and his associates proposed to cross-license the external condenser. Watt adamantly opposed this and they circumvented the patent by their sun and planet gear in 1781. Over the next 6 years, he made other improvements and modifications to the steam engine. A double-acting engine, in which the steam acted alternately on both sides of the piston, was one. He described methods for working the steam "expansively" (i.e., using steam at pressures well above atmospheric). A compound engine, which connected 2 or more engines, was described. Two more patents were granted for these in 1781 and 1782. Numerous other improvements that made for easier manufacture and installation were continually implemented. One of these included the use of the steam
indicator Indicator may refer to: Biology * Environmental indicator of environmental health (pressures, conditions and responses) * Ecological indicator of ecosystem health (ecological processes) * Health indicator, which is used to describe the health o ...
which produced an informative plot of the pressure in the cylinder against its volume, which he kept as a
trade secret Trade secrets are a type of intellectual property that includes formulas, practices, processes, designs, instruments, patterns, or compilations of information that have inherent economic value because they are not generally known or readily ...
. Another important invention, one which Watt was most proud of, was the parallel motion linkage, which was essential in double-acting engines as it produced the straight line motion required for the cylinder rod and pump, from the connected rocking beam, whose end moves in a circular arc. This was patented in 1784. A throttle valve to control the power of the engine, and a centrifugal governor, patented in 1788, to keep it from "running away" were very important. These improvements taken together produced an engine which was up to 5 times as fuel efficient as the Newcomen engine. Because of the danger of exploding boilers, which were in a very primitive stage of development, and the ongoing issues with leaks, Watt restricted his use of high pressure steam – all of his engines used steam at near atmospheric pressure.


Patent trials

Edward Bull Edward Bull (c.1759–1798) was an English engineer, noted for a modified type of steam engine known as the Bull engine. Working with Richard Trevithick, many of these were installed in mines in Cornwall. Life Bull was born about 1759. From 1779 ...
started constructing engines for Boulton and Watt in Cornwall in 1781. By 1792, he had started making engines of his own design, but which contained a separate condenser, and so infringed Watt's patents. Two brothers, Jabez Carter Hornblower and Jonathan Hornblower Jnr also started to build engines about the same time. Others began to modify Newcomen engines by adding a condenser, and the mine owners in Cornwall became convinced that Watt's patent could not be enforced. They started to withhold payments to Boulton and Watt, which by 1795 had fallen on hard times. Of the total £21,000 (equivalent to £ as of ) owed, only £2,500 had been received. Watt was forced to go to court to enforce his claims. He first sued Bull in 1793. The jury found for Watt, but the question of whether or not the original specification of the patent was valid was left to another trial. In the meantime, injunctions were issued against the infringers, forcing their payments of the royalties to be placed in
escrow An escrow is a contractual arrangement in which a third party (the stakeholder or escrow agent) receives and disburses money or property for the primary transacting parties, with the disbursement dependent on conditions agreed to by the transacti ...
. The trial on determining the validity of the specifications which was held in the following year was inconclusive, but the injunctions remained in force and the infringers, except for Jonathan Hornblower, all began to settle their cases. Hornblower was soon brought to trial in 1799, and the verdict of the four was decisively in favour of Watt. Their friend John Wilkinson, who had solved the problem of boring an accurate cylinder, was a particularly grievous case. He had erected about 20 engines without Boulton's and Watts' knowledge. They finally agreed to settle the infringement in 1796. Boulton and Watt never collected all that was owed them, but the disputes were all settled directly between the parties or through arbitration. These trials were extremely costly in both money and time, but ultimately were successful for the firm.


Copying machine

Before 1780, there was no good method for making copies of letters or drawings. The only method sometimes used was a mechanical one using multiple linked pens. Watt at first experimented with improving this method, but soon gave up on this approach because it was so cumbersome. He instead decided to try to physically transfer ink from the front of the original to the back of another sheet, moistened with a solvent, and pressed to the original. The second sheet had to be thin, so that the ink could be seen through it when the copy was held up to the light, thus reproducing the original exactly. Watt started to develop the process in 1779, and made many experiments to formulate the ink, select the thin paper, to devise a method for wetting the special thin paper, and to make a press suitable for applying the correct pressure to effect the transfer. All of these required much experimentation, but he soon had enough success to patent the process a year later. Watt formed another partnership with Boulton (who provided financing) and James Keir (to manage the business) in a firm called James Watt and Co. The perfection of the invention required much more development work before it could be routinely used by others, but this was carried out over the next few years. Boulton and Watt gave up their shares to their sons in 1794. It became a commercial success and was widely used in offices even into the 20th century.


Chemical experiments

From an early age, Watt was very interested in chemistry. In late 1786, while in Paris, he witnessed an experiment by Claude Louis Berthollet in which he reacted
hydrochloric acid Hydrochloric acid, also known as muriatic acid, is an aqueous solution of hydrogen chloride. It is a colorless solution with a distinctive pungent smell. It is classified as a strong acid. It is a component of the gastric acid in the dige ...
with manganese dioxide to produce
chlorine Chlorine is a chemical element with the symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. Chlorine i ...
. He had already found that an aqueous solution of chlorine could bleach textiles, and had published his findings, which aroused great interest among many potential rivals. When Watt returned to Britain, he began experiments along these lines with hopes of finding a commercially viable process. He discovered that a mixture of salt, manganese dioxide and sulphuric acid could produce chlorine, which Watt believed might be a cheaper method. He passed the chlorine into a weak solution of alkali, and obtained a
turbid Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of water quality. Fluids c ...
solution that appeared to have good bleaching properties. He soon communicated these results to James McGrigor, his father-in-law, who was a bleacher in Glasgow. Otherwise, he tried to keep his method a secret. With McGrigor and his wife Annie, he started to scale up the process, and in March 1788, McGrigor was able to bleach of cloth to his satisfaction. About this time, Berthollet discovered the salt and sulphuric acid process, and published it, so it became public knowledge. Many others began to experiment with improving the process, which still had many shortcomings, not the least of which was the problem of transporting the liquid product. Watt's rivals soon overtook him in developing the process, and he dropped out of the race. It was not until 1799, when Charles Tennant patented a process for producing solid bleaching powder (
calcium hypochlorite Calcium hypochlorite is an inorganic compound with formula Ca(OCl)2. It is the main active ingredient of commercial products called bleaching powder, chlorine powder, or chlorinated lime, used for water treatment and as a bleaching agent. This ...
) that it became a commercial success. By 1794, Watt had been chosen by Thomas Beddoes to manufacture apparatuses to produce, clean and store gases for use in the new
Pneumatic Institution The Pneumatic Institution (also referred to as Pneumatic Institute) was a medical research facility in Bristol, England, in 1799–1802. It was established by physician and science writer Thomas Beddoes to study the medical effects of gases, know ...
at Hotwells in
Bristol Bristol () is a City status in the United Kingdom, city, Ceremonial counties of England, ceremonial county and unitary authority in England. Situated on the River Avon, Bristol, River Avon, it is bordered by the ceremonial counties of Glouces ...
. Watt continued to experiment with various gases, but by 1797, the medical uses for the " factitious airs" (artificial gases) had come to a dead end.


Personality

Watt combined theoretical knowledge of science with the ability to apply it practically. Chemist
Humphry Davy Sir Humphry Davy, 1st Baronet, (17 December 177829 May 1829) was a British chemist and inventor who invented the Davy lamp and a very early form of arc lamp. He is also remembered for isolating, by using electricity, several elements for ...
said of him, "Those who consider James Watt only as a great practical mechanic form a very erroneous idea of his character; he was equally distinguished as a natural philosopher and a chemist, and his inventions demonstrate his profound knowledge of those sciences, and that peculiar characteristic of genius, the union of them for practical application". He was greatly respected by other prominent men of the
Industrial Revolution The Industrial Revolution was the transition to new manufacturing processes in Great Britain, continental Europe, and the United States, that occurred during the period from around 1760 to about 1820–1840. This transition included going f ...
. He was an important member of the
Lunar Society of Birmingham The Lunar Society of Birmingham was a British dinner club and informal learned society of prominent figures in the Midlands Enlightenment, including industrialists, natural philosophers and intellectuals, who met regularly between 1765 and 1813 ...
, and was a much sought-after conversationalist and companion, always interested in expanding his horizons. His personal relationships with his friends and business partners were always congenial and long-lasting. According to Lord Liverpool (Prime Minister of the UK),
A more excllent and amikable man in all the relations of life I believe never existed.
Watt was a prolific correspondent. During his years in
Cornwall Cornwall (; kw, Kernow ) is a Historic counties of England, historic county and Ceremonial counties of England, ceremonial county in South West England. It is recognised as one of the Celtic nations, and is the homeland of the Cornish people ...
, he wrote long letters to Boulton several times per week. He was averse to publishing his results in, for example, the '' Philosophical Transactions of the Royal Society'' however, and instead preferred to communicate his ideas in patents. He was an excellent draughtsman. He was a rather poor businessman, and especially hated bargaining and negotiating terms with those who sought to use the steam engine. In a letter to
William Small William Small (13 October 1734 – 25 February 1775) was a Scottish physician and a professor of natural philosophy at the College of William and Mary in Virginia, where he became an influential mentor for Thomas Jefferson. Early life William Sm ...
in 1772, Watt confessed that "he would rather face a loaded cannon than settle an account or make a bargain." Until he retired, he was always very concerned about his financial affairs, and was something of a worrier. His health was often poor and he suffered frequent nervous headaches and depression. When he retired in 1800, he became a rich enough man to pass the business on to his sons.


Soho Foundry

At first, the partnership made the drawings and specifications for the engines, and supervised the work to erect them on the customers' property. They produced almost none of the parts themselves. Watt did most of his work at his home in Harper's Hill in Birmingham, while Boulton worked at the
Soho Manufactory The Soho Manufactory () was an early factory which pioneered mass production on the assembly line principle, in Soho, Birmingham, England, at the beginning of the Industrial Revolution. It operated from 1766–1848 and was demolished in 1853. B ...
. Gradually, the partners began to actually manufacture more and more of the parts, and by 1795, they purchased a property about a mile away from the Soho Manufactory, on the banks of the Birmingham Canal, to establish a new foundry for the manufacture of the engines. The Soho Foundry formally opened in 1796 at a time when Watt's sons, Gregory and James Jr. were heavily involved in the management of the enterprise. In 1800, the year of Watt's retirement, the firm made a total of 41 engines.


Later years

Watt retired in 1800, the same year that his fundamental patent and partnership with Boulton expired. The famous partnership was transferred to the men's sons,
Matthew Robinson Boulton Matthew Robinson Boulton (8 August 1770 – 16 May 1842) was an English manufacturer, a pioneer of management, the son of Matthew Boulton and the father of Matthew Piers Watt Boulton, who first patented the aileron An aileron (French for ...
and James Watt Jr.. Longtime firm engineer
William Murdoch William Murdoch (sometimes spelled Murdock) (21 August 1754 – 15 November 1839) was a Scottish engineer and inventor. Murdoch was employed by the firm of Boulton & Watt and worked for them in Cornwall, as a steam engine erector for ten yea ...
was soon made a partner and the firm prospered. Watt continued to invent other things before and during his semi-retirement. Within his home in Handsworth, Staffordshire, Watt made use of a garret room as a workshop, and it was here that he worked on many of his inventions. Among other things, he invented and constructed machines for copying sculptures and medallions which worked very well, but which he never patented. One of the first sculptures he produced with the machine was a small
head A head is the part of an organism which usually includes the ears, brain, forehead, cheeks, chin, eyes, nose, and mouth, each of which aid in various sensory functions such as sight, hearing, smell, and taste. Some very simple animals ...
of his old professor friend Adam Smith. He maintained his interest in civil engineering and was a consultant on several significant projects. He proposed, for example, a method for constructing a flexible pipe to be used for pumping water under the River Clyde at Glasgow. He and his second wife travelled to France and Germany, and he purchased an estate in mid-Wales at Doldowlod House, one mile south of
Llanwrthwl Llanwrthwl is a village and community in Powys, mid Wales, and the historic county of Brecknockshire. Llanwrthwl lies off the A470 road, north by road from Builth Wells and Newbridge-on-Wye and south of Rhayader. It lies on the River Wye and Riv ...
, which he much improved. In 1816, he took a trip on the
paddle-steamer A paddle steamer is a steamship or steamboat powered by a steam engine that drives paddle wheels to propel the craft through the water. In antiquity, paddle wheelers followed the development of poles, oars and sails, where the first uses were w ...
''
Comet A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process that is called outgassing. This produces a visible atmosphere or coma, and sometimes also a tail. These phenomena ...
'', a product of his inventions, to revisit his home town of Greenock. He died on 25 August 1819 at his home "
Heathfield Hall Heathfield Hall (sometimes referred to as Heathfield House) was a house in Handsworth, Staffordshire (the area became part of Birmingham in 1911), England, built for the engineer James Watt. In 1790, Watt's business partner Matthew Boulton re ...
" near Handsworth in Staffordshire (now part of Birmingham) at the age of 83. He was buried on 2 September in the graveyard of
St Mary's Church, Handsworth St Mary's Church, Handsworth, also known as Handsworth Old Church, is a Grade II* listed Anglican church in Handsworth, Birmingham, England. Its ten-acre (4 hectare) grounds are contiguous with Handsworth Park. It lies just off the Birm ...
. The church has since been extended and his grave is now inside the church.


Family

On 16 July 1764, Watt married his cousin Margaret Miller (d. 1773). They had two children, Margaret (1767–1796) and James (1769–1848). In 1791, their daughter married James Miller. In September 1773, while Watt was working in the
Scottish Highlands The Highlands ( sco, the Hielands; gd, a’ Ghàidhealtachd , 'the place of the Gaels') is a historical region of Scotland. Culturally, the Highlands and the Lowlands diverged from the Late Middle Ages into the modern period, when Lowland S ...
, he learned that his wife, who was pregnant with their third child, was seriously ill. He immediately returned home but found that she had died and their child was stillborn. In 1775, he married Ann MacGregor (d.1832).


Freemasonry

He was Initiated into Scottish Freemasonry in The Glasgow Royal Arch Lodge, No. 77, in 1763. The Lodge ceased to exist in 1810. A Masonic Lodge was named after him in his home town of Glasgow – Lodge James Watt, No. 1215.


Murdoch's contributions

William Murdoch joined Boulton and Watt in 1777. At first, he worked in the pattern shop in Soho, but soon he was erecting engines in Cornwall. He became an important part of the firm and made many contributions to its success including important inventions of his own. John Griffiths, who wrote a biography of him in 1992, has argued that Watt's discouragement of Murdoch's work with high-pressure steam on his steam road locomotive experiments delayed its development: Watt rightly believed that boilers of the time would be unsafe at higher pressures. Watt patented the application of the sun and planet gear to steam in 1781 and a
steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the loco ...
in 1784, both of which have strong claims to have been invented by Murdoch. The patent was never contested by Murdoch, however, and Boulton and Watt's firm continued to use the sun and planet gear in their
rotative engine A beam engine is a type of steam engine where a pivoted overhead beam is used to apply the force from a vertical piston to a vertical connecting rod. This configuration, with the engine directly driving a pump, was first used by Thomas Newcomen ...
s, even long after the patent for the crank expired in 1794. Murdoch was made a partner of the firm in 1810, where he remained until his retirement 20 years later at the age of 76.


Legacy

As one author states, James Watt's improvements to the steam engine "converted it from a prime mover of marginal efficiency into the mechanical workhorse of the Industrial Revolution".


Honours

Watt was much honoured in his own time. In 1784, he was made a fellow of the Royal Society of Edinburgh, and was elected as a member of the Batavian Society for Experimental Philosophy, of
Rotterdam Rotterdam ( , , , lit. ''The Dam on the River Rotte (river), Rotte'') is the second largest List of cities in the Netherlands by province, city and List of municipalities of the Netherlands, municipality in the Netherlands. It is in the Prov ...
, the Netherlands, in 1787. In 1789, he was elected to the elite group, the
Smeatonian Society of Civil Engineers The Smeatonian Society of Civil Engineers was founded in England in 1771. It was the first engineering society to be formed anywhere in the world, and remains the oldest. It was originally known as the Society of Civil Engineers, being renamed fo ...
. In 1806, he was conferred the honorary Doctor of Laws by the
University of Glasgow , image = UofG Coat of Arms.png , image_size = 150px , caption = Coat of arms Flag , latin_name = Universitas Glasguensis , motto = la, Via, Veritas, Vita , ...
. The French Academy elected him a Corresponding Member and he was made a Foreign Associate in 1814. The
watt The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3. It is used to quantify the rate of energy transfer. The watt is named after James ...
is named after James Watt for his contributions to the development of the
steam engine A steam engine is a heat engine that performs mechanical work using steam as its working fluid. The steam engine uses the force produced by steam pressure to push a piston back and forth inside a cylinder. This pushing force can be ...
, and was adopted by the Second Congress of the British Association for the Advancement of Science in 1889 and by the 11th General Conference on Weights and Measures in 1960 as the unit of power incorporated in the
International System of Units The International System of Units, known by the international abbreviation SI in all languages and sometimes pleonastically as the SI system, is the modern form of the metric system and the world's most widely used system of measurement. ...
(or "SI"). On 29 May 2009, the Bank of England announced that Boulton and Watt would appear on a new £50 note. The design is the first to feature a dual portrait on a Bank of England note, and presents the two industrialists side by side with images of Watt's steam engine and Boulton's Soho Manufactory. Quotes attributed to each of the men are inscribed on the note: "I sell here, sir, what all the world desires to have—POWER" (Boulton) and "I can think of nothing else but this machine" (Watt). The inclusion of Watt is the second time that a Scot has featured on a Bank of England note (the first was Adam Smith on the 2007 issue £20 note). In September 2011, it was announced that the notes would enter circulation on 2 November. In 2011, he was one of seven inaugural inductees to the Scottish Engineering Hall of Fame.


Memorials

Watt was buried in the grounds of St. Mary's Church, Handsworth, in Birmingham. Later expansion of the church, over his grave, means that his tomb is now buried ''inside'' the church. The garret room workshop that Watt used in his retirement was left, locked and untouched, until 1853, when it was first viewed by his biographer J. P. Muirhead. Thereafter, it was occasionally visited, but left untouched, as a kind of shrine. A proposal to have it transferred to the Patent Office came to nothing. When the house was due to be demolished in 1924, the room and all its contents were presented to the
Science Museum A science museum is a museum devoted primarily to science. Older science museums tended to concentrate on static displays of objects related to natural history, paleontology, geology, industry and industrial machinery, etc. Modern trends in ...
, where it was recreated in its entirety. It remained on display for visitors for many years, but was walled-off when the gallery it was housed in closed. The workshop remained intact, and preserved, and in March 2011 was put on public display as part of a new permanent Science Museum exhibition, "James Watt and our world". The approximate location of James Watt's birth in Greenock is commemorated by a statue. Other memorials in Greenock include street names and the Watt Memorial Library, which was begun in 1816 with Watt's donation of scientific books, and developed as part of the Watt Institution by his son (which ultimately became the
James Watt College The James Watt College was a further education college in Greenock, Scotland. It is now part of West College Scotland. There were also campuses in Largs and Kilwinning which now form part of Ayrshire College as the result of the merger with ...
). Taken over by the local authority in 1974, the library now also houses the local history collection and archives of
Inverclyde Inverclyde ( sco, Inerclyde, gd, Inbhir Chluaidh, , "mouth of the Clyde") is one of 32 council areas used for local government in Scotland. Together with the East Renfrewshire and Renfrewshire council areas, Inverclyde forms part of the hi ...
, and is dominated by a large seated statue in the
vestibule Vestibule or Vestibulum can have the following meanings, each primarily based upon a common origin, from early 17th century French, derived from Latin ''vestibulum, -i n.'' "entrance court". Anatomy In general, vestibule is a small space or cavity ...
. Watt is additionally commemorated by statuary in
George Square George Square ( gd, Ceàrnag Sheòrais) is the principal civic square in the city of Glasgow, Scotland. It is one of six squares in the city centre, the others being Cathedral Square, St Andrew's Square, St Enoch Square, Royal Exchange ...
, Glasgow and Princes Street, Edinburgh, as well as others in
Birmingham Birmingham ( ) is a city and metropolitan borough in the metropolitan county of West Midlands in England. It is the second-largest city in the United Kingdom with a population of 1.145 million in the city proper, 2.92 million in the We ...
, where he is also remembered by the Moonstones and a school is named in his honour. The James Watt College has expanded from its original location to include campuses in Kilwinning (North Ayrshire), Finnart Street and The Waterfront in Greenock, and the Sports campus in
Largs Largs ( gd, An Leargaidh Ghallda) is a town on the Firth of Clyde in North Ayrshire, Scotland, about from Glasgow. The original name means "the slopes" (''An Leargaidh'') in Scottish Gaelic. A popular seaside resort with a pier, the town mark ...
. Heriot-Watt University near
Edinburgh Edinburgh ( ; gd, Dùn Èideann ) is the capital city of Scotland and one of its 32 Council areas of Scotland, council areas. Historically part of the county of Midlothian (interchangeably Edinburghshire before 1921), it is located in Lothian ...
was at one time the School of Arts of Edinburgh, founded in 1821 as the world's first Mechanics Institute, but to commemorate George Heriot, the 16th-century financier to
King James VI and I James VI and I (James Charles Stuart; 19 June 1566 – 27 March 1625) was King of Scotland as James VI from 24 July 1567 and King of England and Ireland as James I from the union of the Scottish and English crowns on 24 March 1603 until ...
, and James Watt, after
Royal Charter A royal charter is a formal grant issued by a monarch under royal prerogative as letters patent. Historically, they have been used to promulgate public laws, the most famous example being the English Magna Carta (great charter) of 1215, b ...
the name was changed to Heriot-Watt University. Dozens of university and college buildings (chiefly of science and technology) are named after him. Matthew Boulton's home, Soho House, is now a museum, commemorating the work of both men. The
University of Glasgow , image = UofG Coat of Arms.png , image_size = 150px , caption = Coat of arms Flag , latin_name = Universitas Glasguensis , motto = la, Via, Veritas, Vita , ...
's Faculty of Engineering has its headquarters in the James Watt Building, which also houses the department of Mechanical Engineering and the department of Aerospace Engineering. The huge painting ''James Watt contemplating the steam engine'' by James Eckford Lauder is now owned by the National Gallery of Scotland. There is a statue of James Watt in Piccadilly Gardens, Manchester and
City Square, Leeds City Square is a paved area north of Leeds railway station at the junction of Park Row to the east and Wellington Street to the south. It is a triangular area where six roads meet: Infirmary Street and Park Row to the north, Boar Lane and Bish ...
. A colossal statue of Watt by Francis Legatt Chantrey was placed in
Westminster Abbey Westminster Abbey, formally titled the Collegiate Church of Saint Peter at Westminster, is an historic, mainly Gothic church in the City of Westminster, London, England, just to the west of the Palace of Westminster. It is one of the United ...
, and later was moved to
St. Paul's Cathedral St Paul's Cathedral is an Anglican cathedral in London and is the seat of the Bishop of London. The cathedral serves as the mother church of the Diocese of London. It is on Ludgate Hill at the highest point of the City of London and is a Gra ...
. On the cenotaph, the inscription reads, in part, "JAMES WATT ... ENLARGED THE RESOURCES OF HIS COUNTRY, INCREASED THE POWER OF MAN, AND ROSE TO AN EMINENT PLACE AMONG THE MOST ILLUSTRIOUS FOLLOWERS OF SCIENCE AND THE REAL BENEFACTORS OF THE WORLD". A bust of Watt is in the Hall of Heroes of the
National Wallace Monument The National Wallace Monument (generally known as the Wallace Monument) is a 67 metre tower on the shoulder of the Abbey Craig, a hilltop overlooking Stirling in Scotland. It commemorates Sir William Wallace, a 13th- and 14th-century Scottish hero ...
in Stirling, Scotland.


Patents

Watt was the sole inventor listed on his 6 patents:Hills, vol 3, p. 13 * Patent 913: A method of lessening the consumption of steam in steam engines – the separate condenser. The specification was accepted on 5 January 1769; enrolled on 29 April 1769, and extended to June 1800 by an Act of Parliament in 1775. * Patent 1,244: A new method of copying letters. The specification was accepted on 14 February 1780 and enrolled on 31 May 1780. * Patent 1,306: New methods to produce a continued rotation motion – sun and planet. The specification was accepted on 25 October 1781 and enrolled on 23 February 1782. * Patent 1,321: New improvements upon steam engines – expansive and double acting. The specification was accepted on 14 March 1782 and enrolled on 4 July 1782. * Patent 1,432: New improvements upon steam engines – three bar motion and steam carriage. The specification was accepted on 28 April 1782 and enrolled on 25 August 1782. * Patent 1,485: Newly improved methods of constructing furnaces. The specification was accepted on 14 June 1785 and enrolled on 9 July 1785.


References


Sources

* "Some Unpublished Letters of James Watt" in ''Journal of
Institution of Mechanical Engineers The Institution of Mechanical Engineers (IMechE) is an independent professional association and learned society headquartered in London, United Kingdom, that represents mechanical engineers and the engineering profession. With over 120,000 member ...
'' (London, 1915). * Carnegie, Andrew, ''James Watt'' University Press of the Pacific (2001) (Reprinted from the 1913 ed.), . * * Dickinson, H. W. and Hugh Pembroke Vowles ''James Watt and the Industrial Revolution'' (published in 1943, new edition 1948 and reprinted in 1949. Also published in Spanish and Portuguese (1944) by the British Council) * Hills, Rev. Dr. Richard L., ''James Watt, Vol 1, His time in Scotland, 1736–1774'' (2002); Vol 2, ''The years of toil, 1775–1785''; Vol 3 ''Triumph through adversity 1785–1819.'' Landmark Publishing Ltd, . * * * Marsden, Ben. ''Watt's Perfect Engine'' Columbia University Press (New York, 2002) . * Marshall, Thomas H. (1925), ''James Watt''
Chapter 3: Mathematical Instrument Maker
fro
Steam Engine Library
of
University of Rochester The University of Rochester (U of R, UR, or U of Rochester) is a private research university in Rochester, New York. The university grants undergraduate and graduate degrees, including doctoral and professional degrees. The University of ...
Department of History. * Marshall, Thomas H. (1925
''James Watt''
University of Rochester The University of Rochester (U of R, UR, or U of Rochester) is a private research university in Rochester, New York. The university grants undergraduate and graduate degrees, including doctoral and professional degrees. The University of ...
Department of History. * * * Roll, Erich (1930). ''An Early Experiment in Industrial Organisation : being a History of the Firm of Boulton & Watt.'' 1775–1805. Longmans, Green and Co. * Smiles, Samuel, ''Lives of the Engineers'', (London, 1861–62, new edition, five volumes, 1905). ;Related topics * *


External links


James Watt by Andrew Carnegie (1905)

Librivox audiobook: James Watt by Andrew Carnegie (1905)

James Watt by Thomas H. Marshall (1925)

Archives of Soho
at Birmingham Central Library.
BBC History: James Watt



Revolutionary Players website

Cornwall Record Office Boulton and Watt letters


* {{DEFAULTSORT:Watt, James Scottish inventors 1736 births 1819 deaths Alumni of the University of Glasgow Fellows of the Royal Society Fellows of the Royal Society of Edinburgh Industrial Revolution in England Industrial Revolution in Scotland Members of the Lunar Society of Birmingham People associated with Heriot-Watt University People from Greenock People of the Scottish Enlightenment People associated with energy Scottish business theorists Scottish businesspeople Scottish chemists Scottish deists Scottish Presbyterians Scottish surveyors 18th-century British engineers 18th-century British scientists 18th-century Scottish people Scottish Engineering Hall of Fame inductees