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Micrometer (device)
A micrometer, sometimes known as a micrometer screw gauge (MSG), is a device incorporating a calibrated screw for Accuracy and precision, accurate measurement of the size of components. It widely used in mechanical engineering, machining, metrology as well as most mechanical trades, along with other dimensional instruments such as Caliper#Dial caliper, dial, Caliper#Vernier caliper, vernier, and Caliper#Digital caliper, digital calipers. Micrometers are usually, but not always, in the form of calipers (opposing ends joined by a frame). The spindle is a very accurately machined screw and the object to be measured is placed between the spindle and the anvil. The spindle is moved by turning the ratchet knob or thimble until the object to be measured is lightly touched by both the spindle and the anvil. History The word ''micrometer'' is a classical compound, neoclassical coinage from and . According to the Webster's Dictionary#Merriam-Webster Collegiate Dictionary, ''Merriam-Web ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mahr Micromar 40A 0–25 Mm Micrometer
In Islam, a mahr (in ; ; Bengali language, Bengali: দেনমোহর; ; ; ; also Romanization of Arabic, transliterated ''mehr'', ''meher'', ''denmohor, mehrieh'', or ''mahriyeh'') is the bride wealth obligation, in the form of money, possessions or teaching of verses from the Quran by the groom, to the bride in connection with an Marriage in Islam, Islamic wedding. While the ''mahr'' is often money, it can also be anything agreed upon by the bride such as jewelry, home goods, furniture, a dwelling or some land. Mahr is typically specified in the marriage contract signed upon marriage. "Dower" is the English translation that comes closest to Islamic meaning of mahr, as "dower" refers to the payment from the husband or his family to the wife, especially to support her in the event of his death, although subsequent to marriage the wife also acquires inheritance rights. However, mahr is distinct from dower in two ways: 1) mahr is legally required for all Islamic marriages while ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Maudslay
Henry Maudslay ( pronunciation and spelling) (22 August 1771 – 14 February 1831) was an English machine tool innovator, tool and die maker, and inventor. He is considered a founding father of machine tool technology. His inventions were an important foundation for the Industrial Revolution. Maudslay's invention of a metal lathe to cut metal, circa 1800, enabled the manufacture of standard screw thread sizes. Standard screw thread sizes allowed interchangeable parts and the development of mass production. Early life Maudslay was the fifth of seven children of Henry Maudslay, a wheelwright in the Royal Engineers, and Margaret (''nee'' Whitaker), the young widow of Joseph Laundy. His father was wounded in action and so in 1756 became an 'artificer' at the Royal Arsenal, Woolwich (then in Kent), where he remained until 1776 and died in 1780. The family lived in an alley that no longer exists, off Beresford Square, between Powis Street and Beresford Street. Career Maudsl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John H
John is a common English name and surname: * John (given name) * John (surname) John may also refer to: New Testament Works * Gospel of John, a title often shortened to John * First Epistle of John, often shortened to 1 John * Second Epistle of John, often shortened to 2 John * Third Epistle of John, often shortened to 3 John People * John the Baptist (died ), regarded as a prophet and the forerunner of Jesus Christ * John the Apostle (died ), one of the twelve apostles of Jesus Christ * John the Evangelist, assigned author of the Fourth Gospel, once identified with the Apostle * John of Patmos, also known as John the Divine or John the Revelator, the author of the Book of Revelation, once identified with the Apostle * John the Presbyter, a figure either identified with or distinguished from the Apostle, the Evangelist and John of Patmos Other people with the given name Religious figures * John, father of Andrew the Apostle and Saint Peter * Pope Joh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Simeon North
Simeon North (July 13, 1765 – August 25, 1852) was an American gun manufacturer, who developed one of America's first milling machines (possibly the very first) in 1818 and played an important role in the development of interchangeable parts manufacturing. North was born in Berlin, Connecticut, into a prosperous family able to provide all six sons with farms of their own. North was given a farm in Berlin, a gift that enabled him to marry Lucy Savage when he was only twenty-one years old; the couple had five sons and three daughters. In 1795 the Norths purchased a sawmill located on the brook that ran beside their land. Simeon hired a man to help run it, enlarged the building to house a forge and trip-hammer, and began manufacturing scythes from imported steel. Four years later, he obtained a contract to make pistols and began to add a factory to the mill building. North's brother-in-law Elisha Cheney was a skilled clockmaker, a trade he had learned from his father Benjamin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Louis De Tousard
Louis de Tousard (1749–1817) was a French artillerist who served in the American Continental Army under La Fayette, and later was given a US commission. Tousard wrote two very influential books: one was a proposal for a school for officers that became the blueprint for West Point, and the other was a manual for artillery officers that became standard in the young army.. Biography He is the brother of Antoine Étienne de Tousard. Educated at the Strasbourg school of artillery,. Tousard served with the Continental Army between 1777–1778 and lost an arm due to wound received in the Battle of Rhode Island. He was decorated with the Order of Saint Louis on his return to France. After being briefly imprisoned during the French Revolution in 1793 at Prison de l'Abbaye, he returned to the US in 1795 where he received a commission as a major in the 2nd U.S. Artillery Regiment in the Corps of Artillerists and Engineers. By 1800 he was a lieutenant colonel and Inspector of Artill ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jean-Baptiste Vaquette De Gribeauval
Lieutenant General Jean-Baptiste Vaquette de Gribeauval (; 15 September 1715 – 9 May 1789) was a French artillery officer and engineer who revolutionised the French cannon, creating a new production system that allowed for lighter, more uniform guns without sacrificing range. His Gribeauval system superseded the de Vallière system. These guns proved essential to French military victories during the Napoleonic Wars. Gribeauval is credited as the earliest known advocate for the interchangeability of gun parts. He is thus one of the principal influences on the later development (over many decades by many people) of interchangeable manufacture. Early life Jean-Baptiste was born in Amiens, the son of a magistrate. He entered the French royal artillery in 1732 as a volunteer, and became an officer in 1735. For nearly twenty years regimental duty and scientific work occupied him, and in 1752 he became captain of a company of miners.Summerfield (2011) ''SOJ-2'', p. 20 In 1755, he w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interchangeable Parts
Interchangeable parts are parts (wikt:component#Noun, components) that are identical for practical purposes. They are made to specifications that ensure that they are so nearly identical that they will fit into any assembly of the same type. One such part can freely replace another, without any custom fitting, such as File (tool), filing. This interchangeability allows easy assembly of new devices, and easier repair of existing devices, while minimizing both the time and skill required of the person doing the assembly or repair. The concept of interchangeability was crucial to the introduction of the assembly line at the beginning of the 20th century, and has become an important element of some modern manufacturing but is missing from other important industries. Interchangeability of parts was achieved by combining a number of innovations and improvements in machining operations and the invention of several machine tools, such as the Henry Maudslay#Lathe design, slide rest lathe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toolroom
Tool and die makers are highly skilled crafters working in the manufacturing industries. Tool and die makers work primarily in toolroom environments—sometimes literally in one room but more often in an environment with flexible, semipermeable boundaries from production work. They are skilled artisans ( craftspeople) who typically learn their trade through a combination of academic coursework and with substantial period of on-the-job training that is functionally an apprenticeship. They make jigs, fixtures, dies, molds, machine tools, cutting tools, gauges, and other tools used in manufacturing processes. Divisions The main divisions of the tool & die industry include: *Die casting * Dies * Fixtures *Forging * Gauges * Jigs * Metal working * Moulding Job description Working from engineering drawings developed by the toolmaker, engineers or technologists, tool makers lay out the design on the raw material (usually metal), then cut it to size and shape using manually contr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward W
Edward is an English language, English male name. It is derived from the Old English, Anglo-Saxon name ''Ēadweard'', composed of the elements ''wikt:ead#Old English, ēad'' "wealth, fortunate; prosperous" and ''wikt:weard#Old English, weard'' "guardian, protector”. History The name Edward was very popular in Anglo-Saxon England, but the rule of the House of Normandy, Norman and House of Plantagenet, Plantagenet dynasties had effectively ended its use amongst the upper classes. The popularity of the name was revived when Henry III of England, Henry III named his firstborn son, the future Edward I of England, Edward I, as part of his efforts to promote a cult around Edward the Confessor, for whom Henry had a deep admiration. Variant forms The name has been adopted in the Iberian Peninsula#Modern Iberia, Iberian peninsula since the 15th century, due to Edward, King of Portugal, whose mother was English. The Spanish/Portuguese forms of the name are Eduardo and Duarte (name), Duart ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brown & Sharpe
Brown & Sharpe is a division of Hexagon AB, a Sweden, Swedish multinational corporation focused mainly on metrology, metrological tools and technology. During the 19th and 20th centuries, Brown & Sharpe was one of the best-known and most influential machine tool builders and was a leading manufacturer of instruments for machinists (such as Micrometer (device), micrometers and indicator (distance amplifying instrument), indicators). Its reputation and influence were such that its name is often considered to be inseparably paired with certain industrial standards that it helped establish, including: * The American wire gauge (AWG) standards for wire; * The Machine taper#Brown & Sharpe, Brown & Sharpe taper in machine tool spindle tapers; and * The Brown & Sharpe worm threadform for worm gears. Since being acquired by Hexagon Metrology in 2001, Brown and Sharpe has concentrated exclusively on metrology equipment. History Founding (1833) and early years Brown & Sharpe was found ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paris
Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of cities in the European Union by population within city limits, fourth-most populous city in the European Union and the List of cities proper by population density, 30th most densely populated city in the world in 2022. Since the 17th century, Paris has been one of the world's major centres of finance, diplomacy, commerce, culture, Fashion capital, fashion, and gastronomy. Because of its leading role in the French art, arts and Science and technology in France, sciences and its early adoption of extensive street lighting, Paris became known as the City of Light in the 19th century. The City of Paris is the centre of the Île-de-France region, or Paris Region, with an official estimated population of 12,271,794 inhabitants in January 2023, or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jean Laurent Palmer
Jean may refer to: People * Jean (female given name) * Jean (male given name) * Jean (surname) Fictional characters * Jean Grey, a Marvel Comics character * Jean Valjean, fictional character in novel ''Les Misérables'' and its adaptations * Jean Pierre Polnareff, a fictional character from ''JoJo's Bizarre Adventure'' * Jean Luc Picard, fictional character from ''Star Trek Next Generation'' Places * Jean, Nevada, United States; a town * Jean, Oregon, United States Entertainment * Jean (dog), a female collie in silent films * "Jean" (song) (1969), by Rod McKuen, also recorded by Oliver * ''Jean Seberg'' (musical), a 1983 musical by Marvin Hamlisch Other uses * JEAN (programming language) * USS ''Jean'' (ID-1308), American cargo ship c. 1918 * Sternwheeler Jean, a 1938 paddleboat of the Willamette River See also *Jehan * * Gene (other) * Jeanne (other) * Jehanne (other) * Jeans (other) * John (other) John is a common Engl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
