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Pneumatic tubes (or capsule pipelines, also known as pneumatic tube transport or PTT) are systems that propel cylindrical containers through networks of
tubes Tube or tubes may refer to: * ''Tube'' (2003 film), a 2003 Korean film * ''The Tube'' (TV series), a music related TV series by Channel 4 in the United Kingdom * "Tubes" (Peter Dale), performer on the Soccer AM television show * Tube (band), a ...
by
compressed air Compressed air is air kept under a pressure that is greater than atmospheric pressure. Compressed air is an important medium for transfer of energy in industrial processes, and is used for power tools such as air hammers, drills, wrenches, and o ...
or by partial
vacuum A vacuum is a space devoid of matter. The word is derived from the Latin adjective ''vacuus'' for "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure. Physicists often dis ...
. They are used for transporting solid objects, as opposed to conventional pipelines which transport fluids. In the late 19th and early 20th centuries, pneumatic tube networks gained acceptance in offices that needed to transport small, urgent packages, such as mail, other paperwork, or money, over relatively short distances, within a building or, at most, within a city. Some installations became quite complex, but have mostly been superseded. However, they have been further developed in the 21st century in places such as hospitals, to send blood samples and the like to clinical laboratories for analysis. A small number of pneumatic transportation systems were built for larger cargo, to compete with train and subway systems. However, they never gained popularity.


History


Historical use

Pneumatic transportation was invented by
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 ye ...
around 1799. ''Capsule pipelines'' were first used in the
Victorian era In the history of the United Kingdom and the British Empire, the Victorian era was the period of Queen Victoria's reign, from 20 June 1837 until her death on 22 January 1901. The era followed the Georgian period and preceded the Edwardian ...
, to transmit
telegrams Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas p ...
from telegraph stations to nearby buildings. The system is known as pneumatic dispatch. In 1854,
Josiah Latimer Clark Josiah Latimer Clark FRS FRAS (10 March 1822 – 30 October 1898), was an English electrical engineer, born in Great Marlow, Buckinghamshire. Biography Josiah Latimer Clark was born in Great Marlow, Buckinghamshire, and was younger brother ...
was issued a patent "for conveying letters or parcels between places by the pressure of air and vacuum". In 1853, he installed a pneumatic system between the
London Stock Exchange London Stock Exchange (LSE) is a stock exchange in the City of London, England, United Kingdom. , the total market value of all companies trading on LSE was £3.9 trillion. Its current premises are situated in Paternoster Square close to St Pau ...
in
Threadneedle Street Threadneedle Street is a street in the City of London, England, between Bishopsgate at its northeast end and Bank junction in the southwest. It is one of nine streets that converge at Bank. It lies in the ward of Cornhill. History The stre ...
, London, and the offices of the
Electric Telegraph Company The Electric Telegraph Company (ETC) was a British telegraph company founded in 1846 by William Fothergill Cooke and John Ricardo. It was the world's first public telegraph company. The equipment used was the Cooke and Wheatstone telegraph, ...
in
Lothbury Lothbury is a short street in the City of London. It runs east–west with traffic flow in both directions, from Gresham Street's junction with Moorgate to the west, and Bartholomew Lane's junction with Throgmorton Street to the east. History ...
. The Electric Telegraph Company used the system to acquire stock prices and other financial information to pass to subscribers of their service over their telegraph wires. The advantage of the pneumatic system was that, without it, the company would have had to employ runners to carry messages between the two buildings, or else employ trained telegraph operators within the Stock Exchange. In the mid-1860s, the company installed similar systems to local stock exchanges in Liverpool, Birmingham, and Manchester. After the telegraphs were nationalised in Britain, the pneumatic system continued to be expanded under Post Office Telegraphs. That expansion was due to Joseph William Willmot (previously employed at the Electric & International Telegraph Company) improving Latimer-Clark's invention in 1870 with the "double sluice pneumatic valve" and, in 1880, the "intermediate signaller/quick break switch for pneumatic tubes", which dramatically speeded up the process, and made it possible for a number of carrier messages to be in the tube at any one time. By 1880, there were over of tube in London. A tube was laid between the Aberdeen fish market office and the main post office, to facilitate the rapid sale of the very perishable commodity. While they are commonly used for small parcels and documents, including cash carriers at
bank A bank is a financial institution that accepts deposits from the public and creates a demand deposit while simultaneously making loans. Lending activities can be directly performed by the bank or indirectly through capital markets. Because ...
s or
supermarket A supermarket is a self-service Retail#Types of outlets, shop offering a wide variety of food, Drink, beverages and Household goods, household products, organized into sections. This kind of store is larger and has a wider selection than earli ...
s, in the early 19th century, they were proposed for transport of heavy freight. It was once envisaged that networks of massive tubes might be used to transport people.


Contemporary use

The technology is still used on a smaller scale. While its use for communicating information has been superseded by electronics, pneumatic tubes are widely used for transporting small objects, where convenience and speed in a local environment are important. In the United States, drive-up banks often used pneumatic tubes to transport cash and documents between cars and tellers; by the 2020s some of these have been removed, obviated by the rise of mobile banking apps and the increasing sophistication of ATMs. Many hospitals have a computer-controlled pneumatic tube system to deliver drugs, documents and specimens to and from laboratories and nurses' stations. Many factories use them to deliver parts quickly across large campuses. Many larger stores use systems to securely transport excess cash from checkout stands to back offices, and to send change back to cashiers. They are used in casinos to move money, chips, and cards quickly and securely. Japanese
love hotel A love hotel is a type of short-stay hotel found around the world operated primarily for the purpose of allowing guests privacy for sexual activities. The name originates from "Hotel Love" in Osaka, which was built in 1968 and had a rotating ...
s use them to allow customers to settle bills anonymously (no face-to-face contact). NASA's original Mission Control Center had pneumatic tubes connecting controller consoles with staff support rooms. Mission Operations Control Room 2, was last used in its original configuration in 1992 and then remodeled for other missions. Because the room was designated a
National Historic Landmark A National Historic Landmark (NHL) is a building, district, object, site, or structure that is officially recognized by the United States government for its outstanding historical significance. Only some 2,500 (~3%) of over 90,000 places listed ...
in 1985, it was decided in 2017 to restore it to its 1960s condition. The pneumatic tubes were removed and sent to the
Cosmosphere Cosmosphere is a space museum and STEM education center in Hutchinson, Kansas, United States. It was previously known as the Kansas Cosmosphere. The museum houses over 13,000 spaceflight artifacts—the largest combined collection of US and R ...
in Kansas for restoration. Pneumatic tube systems have been used in
nuclear chemistry Nuclear chemistry is the sub-field of chemistry dealing with radioactivity, nuclear processes, and transformations in the nuclei of atoms, such as nuclear transmutation and nuclear properties. It is the chemistry of radioactive elements such as ...
to transport samples during
neutron activation analysis Neutron activation analysis (NAA) is the nuclear process used for determining the concentrations of elements in many materials. NAA allows discrete sampling of elements as it disregards the chemical form of a sample, and focuses solely on atomic ...
. Samples must be moved from the nuclear reactor core, in which they are bombarded with neutrons, to the instrument that measures the resulting radiation. As some of the radioactive isotopes in the sample can have very short half-lives, speed is important. These systems may be automated, with a magazine of sample tubes that are moved into the reactor core in turn for a predetermined time, before being moved to the instrument station and finally to a container for storage and disposal. Until it closed in early 2011, a McDonald's in
Edina, Minnesota Edina ( ) is a city in Hennepin County, Minnesota, United States and a first-ring suburb of Minneapolis. The population was 53,494 at the 2020 census, making it the 18th most populous city in Minnesota. Edina began as a small farming and mil ...
claimed to be the "World's Only Pneumatic Air Drive-Thru," sending food from their strip-mall location to a drive-through in the middle of a parking lot. Technology editor Quentin Hardy noted renewed interest in transmission of data by pneumatic tube accompanied discussions of digital network security, and he cited research into London's forgotten pneumatic network. Related applications include fish cannons which use mechanisms very similar to pneumatic tube systems.


Applications


In postal service

Pneumatic post or pneumatic mail is a system to deliver letters through pressurized air tubes. It was invented by the Scottish 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 ye ...
in the 19th century and was later developed by the
London Pneumatic Despatch Company The London Pneumatic Despatch Company (also known as the London Pneumatic Dispatch Company) was formed on 30 June 1859, to design, build and operate an underground railway system for the carrying of mail, parcels and light freight between locati ...
. Pneumatic post systems were used in several large cities starting in the second half of the 19th century (including an 1866 London system powerful and large enough to transport humans during trial runs – though not intended for that purpose), but later were largely abandoned. A major network of tubes in
Paris Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. S ...
(the Paris pneumatic post) was in use until 1984, when it was abandoned in favor of computers and fax machines. The Prague pneumatic post commenced for the public in 1889 in
Prague Prague ( ; cs, Praha ; german: Prag, ; la, Praga) is the capital and largest city in the Czech Republic, and the historical capital of Bohemia. On the Vltava river, Prague is home to about 1.3 million people. The city has a tempera ...
, now in the Czech Republic, and the network extended approximately . Pneumatic post stations usually connect post offices, stock exchanges, banks and ministries. Italy was the only country to issue
postage stamp A postage stamp is a small piece of paper issued by a post office, postal administration, or other authorized vendors to customers who pay postage (the cost involved in moving, insuring, or registering mail), who then affix the stamp to the fa ...
s (between 1913 and 1966) specifically for pneumatic post. Austria, France, and Germany issued
postal stationery A piece of postal stationery is a stationery item, such as a stamped envelope, letter sheet, postal card, lettercard, aerogram or wrapper, with an imprinted stamp or inscription indicating that a specific rate of postage or related servic ...
for pneumatic use. Typical applications are in
bank A bank is a financial institution that accepts deposits from the public and creates a demand deposit while simultaneously making loans. Lending activities can be directly performed by the bank or indirectly through capital markets. Because ...
s,
hospital A hospital is a health care institution providing patient treatment with specialized health science and auxiliary healthcare staff and medical equipment. The best-known type of hospital is the general hospital, which typically has an emergency ...
s and
supermarket A supermarket is a self-service Retail#Types of outlets, shop offering a wide variety of food, Drink, beverages and Household goods, household products, organized into sections. This kind of store is larger and has a wider selection than earli ...
s. Many large retailers used pneumatic tubes to transport cheques or other documents from cashiers to the accounting office. ; Historical use * 1853: linking the London Stock Exchange to the city's main telegraph station (a distance of ) * 1861: in London with the
London Pneumatic Despatch Company The London Pneumatic Despatch Company (also known as the London Pneumatic Dispatch Company) was formed on 30 June 1859, to design, build and operate an underground railway system for the carrying of mail, parcels and light freight between locati ...
providing services from
Euston railway station Euston railway station ( ; also known as London Euston) is a central London railway terminus in the London Borough of Camden, managed by Network Rail. It is the southern terminus of the West Coast Main Line, the UK's busiest inter-city rail ...
to the
General Post Office The General Post Office (GPO) was the state postal system and telecommunications carrier of the United Kingdom until 1969. Before the Acts of Union 1707, it was the postal system of the Kingdom of England, established by Charles II in 1660. ...
and
Holborn Holborn ( or ) is a district in central London, which covers the south-eastern part of the London Borough of Camden and a part ( St Andrew Holborn Below the Bars) of the Ward of Farringdon Without in the City of London. The area has its roots ...
* 1864: in
Liverpool Liverpool is a city and metropolitan borough in Merseyside, England. With a population of in 2019, it is the 10th largest English district by population and its metropolitan area is the fifth largest in the United Kingdom, with a populat ...
connecting the ''Electric and International Telegraph Company'' telegraph stations in Castle Street, Water Street and the Exchange Buildings * 1864: in
Manchester Manchester () is a city in Greater Manchester, England. It had a population of 552,000 in 2021. It is bordered by the Cheshire Plain to the south, the Pennines to the north and east, and the neighbouring city of Salford to the west. The tw ...
to connect the ''Electric and International Telegraph Company'' central offices at York Street, with branch offices at Dulcie Buildings and Mosley Street * 1865: 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 West ...
, installed by the ''Electric and International Telegraph Company'' between the New Exchange Buildings in Stephenson Place and their branch office in Temple Buildings, New Street. * 1865: in Berlin (until 1976), the ''Rohrpost'', a system 400 kilometers in total length at its peak in 1940 * 1866: in Paris (until 1984, 467 kilometers in total length from 1934).
John Steinbeck John Ernst Steinbeck Jr. (; February 27, 1902 – December 20, 1968) was an American writer and the 1962 Nobel Prize in Literature winner "for his realistic and imaginative writings, combining as they do sympathetic humor and keen social ...
mentioned this system in ''
The Short Reign of Pippin IV ''The Short Reign of Pippin IV: A Fabrication'' is a novel by John Steinbeck published in 1957; his only political satire, the book pokes fun at French politics. Plot summary ''Pippin IV'' explores the life of Pippin Héristal, an amateur astro ...
: A Fabrication'': "You pay no attention to the pneumatique." * 1871: in
Dublin Dublin (; , or ) is the capital and largest city of Ireland. On a bay at the mouth of the River Liffey, it is in the province of Leinster, bordered on the south by the Dublin Mountains, a part of the Wicklow Mountains range. At the 2016 cen ...
* 1875: in Vienna (until 1956) - including the unrealised corpse network of Zentralfriedhof * 1887: in Prague (until 2002 due to flooding), the Prague pneumatic post * 1893: the first North American system was established in
Philadelphia Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since ...
by
Postmaster General A Postmaster General, in Anglosphere countries, is the chief executive officer of the postal service of that country, a ministerial office responsible for overseeing all other postmasters. The practice of having a government official responsib ...
John Wanamaker John Wanamaker (July 11, 1838December 12, 1922) was an American merchant and religious, civic and political figure, considered by some to be a proponent of advertising and a "pioneer in marketing". He was born in Philadelphia, Pennsylvania, a ...
, who had previously employed the technology at his
department store A department store is a retail establishment offering a wide range of consumer goods in different areas of the store, each area ("department") specializing in a product category. In modern major cities, the department store made a dramatic appea ...
. The system, which initially connected the downtown post offices, was later extended to the principal railroad stations, the stock exchanges, and many private businesses. It was operated by the
United States Post Office Department The United States Post Office Department (USPOD; also known as the Post Office or U.S. Mail) was the predecessor of the United States Postal Service, in the form of a Cabinet department, officially from 1872 to 1971. It was headed by the postma ...
which later opened similar systems in cities such as
New York New York most commonly refers to: * New York City, the most populous city in the United States, located in the state of New York * New York (state), a state in the northeastern United States New York may also refer to: Film and television * ...
(connecting Brooklyn and
Manhattan Manhattan (), known regionally as the City, is the most densely populated and geographically smallest of the five boroughs of New York City. The borough is also coextensive with New York County, one of the List of counties in New York, origin ...
), Chicago,
Boston Boston (), officially the City of Boston, is the state capital and most populous city of the Commonwealth of Massachusetts, as well as the cultural and financial center of the New England region of the United States. It is the 24th- most p ...
, and
St. Louis St. Louis () is the second-largest city in Missouri, United States. It sits near the confluence of the Mississippi and the Missouri Rivers. In 2020, the city proper had a population of 301,578, while the bi-state metropolitan area, which e ...
. The last of these closed in 1953. * Other cities: Munich, Rio de Janeiro, Buenos Aires, Hamburg, Rome, Naples, Milan, Marseille, Melbourne, Tokyo, Osaka, Nagoya, Kobe * 1950s-1989: CIA headquarters (now known as the Old Headquarters Building)


In public transportation

;19th century In 1812, George Medhurst first proposed, but never implemented, blowing passenger carriages through a tunnel. Precursors of pneumatic tube systems for passenger transport, the
atmospheric railway An atmospheric railway uses differential air pressure to provide power for propulsion of a railway vehicle. A static power source can transmit motive power to the vehicle in this way, avoiding the necessity of carrying mobile power generating eq ...
(for which the tube was laid between the rails, with a piston running in it suspended from the train through a sealable slot in the top of the tube) were operated as follows: * 1844–54:
Dublin and Kingstown Railway The Dublin and Kingstown Railway (D&KR), which opened in 1834, was Ireland’s first passenger railway. It linked Westland Row in Dublin with Kingstown Harbour (Dún Laoghaire) in County Dublin. The D&KR was also notable for a number of othe ...
's
Dalkey Atmospheric Railway The Dalkey Atmospheric Railway (unofficial opening 19 August 1843, official opening 29 March 1844 – 12 April 1854) was an extension of the Dublin and Kingstown Railway (D&KR) to Atmospheric Road in Dalkey, Co. Dublin, Ireland. It used part o ...
between Kingstown (
Dún Laoghaire Dún Laoghaire ( , ) is a suburban coastal town in Dublin in Ireland. It is the administrative centre of Dún Laoghaire–Rathdown. The town was built following the 1816 legislation that allowed the building of a major port to serve Dublin ...
) and
Dalkey Dalkey ( ; ) is an affluent suburb of Dublin, and a seaside resort southeast of the city, and the town of Dún Laoghaire, in the county of Dún Laoghaire–Rathdown in the historic County Dublin, Ireland. It was founded as a Viking settlement ...
,
Ireland Ireland ( ; ga, Éire ; Ulster-Scots: ) is an island in the North Atlantic Ocean, in north-western Europe. It is separated from Great Britain to its east by the North Channel, the Irish Sea, and St George's Channel. Ireland is the s ...
() * 1846–47:
London and Croydon Railway The London and Croydon Railway (L&CR) was an early railway in England. It opened in 1839 and in February 1846 merged with other railways to form the London Brighton and South Coast Railway (LB&SCR). Origins The Croydon line and other railways Th ...
between
Croydon Croydon is a large town in south London, England, south of Charing Cross. Part of the London Borough of Croydon, a local government district of Greater London. It is one of the largest commercial districts in Greater London, with an extensive ...
and
New Cross New Cross is an area in south east London, England, south-east of Charing Cross in the London Borough of Lewisham and the SE14 postcode district. New Cross is near St Johns, Telegraph Hill, Nunhead, Peckham, Brockley, Deptford and Greenwic ...
,
London London is the capital and 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 down to the North Sea, and has been a major s ...
, England () * 1847–48:
Isambard Kingdom Brunel Isambard Kingdom Brunel (; 9 April 1806 – 15 September 1859) was a British civil engineer who is considered "one of the most ingenious and prolific figures in engineering history," "one of the 19th-century engineering giants," and "one ...
's South Devon Railway between
Exeter Exeter () is a city in Devon, South West England. It is situated on the River Exe, approximately northeast of Plymouth and southwest of Bristol. In Roman Britain, Exeter was established as the base of Legio II Augusta under the personal c ...
and
Newton Abbot Newton Abbot is a market town and civil parish on the River Teign in the Teignbridge District of Devon, England. Its 2011 population of 24,029 was estimated to reach 26,655 in 2019. It grew rapidly in the Victorian era as the home of the Sou ...
, England () * 1847–60:
Paris Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. S ...
–Saint-Germain railway between Bois de Vésinet and
Saint-Germain-en-Laye Saint-Germain-en-Laye () is a commune in the Yvelines department in the Île-de-France in north-central France. It is located in the western suburbs of Paris, from the centre of Paris. Inhabitants are called ''Saint-Germanois'' or ''Saint-Ge ...
, France () In 1861, the ''
London Pneumatic Despatch Company The London Pneumatic Despatch Company (also known as the London Pneumatic Dispatch Company) was formed on 30 June 1859, to design, build and operate an underground railway system for the carrying of mail, parcels and light freight between locati ...
'' built a system large enough to move a person, although it was intended for parcels. The inauguration of the new
Holborn Holborn ( or ) is a district in central London, which covers the south-eastern part of the London Borough of Camden and a part ( St Andrew Holborn Below the Bars) of the Ward of Farringdon Without in the City of London. The area has its roots ...
Station on 10 October 1865 was marked by having the
Duke of Buckingham Duke of Buckingham held with Duke of Chandos, referring to Buckingham, is a title that has been created several times in the peerages of England, Great Britain, and the United Kingdom. There have also been earls and marquesses of Buckingham. ...
, the chairman, and some company directors blown through the tube to Euston (a five-minute trip). The Crystal Palace pneumatic railway was exhibited at
the Crystal Palace The Crystal Palace was a cast iron and plate glass structure, originally built in Hyde Park, London, to house the Great Exhibition of 1851. The exhibition took place from 1 May to 15 October 1851, and more than 14,000 exhibitors from around th ...
in 1864. This was a prototype for a proposed ''
Waterloo and Whitehall Railway The Waterloo and Whitehall Railway was a proposed and partly constructed 19th century Rammell pneumatic railway in central London intended to run under the River Thames just upstream from Hungerford Bridge, running from Waterloo station to th ...
'' that would have run under the
River Thames The River Thames ( ), known alternatively in parts as the River Isis, is a river that flows through southern England including London. At , it is the longest river entirely in England and the second-longest in the United Kingdom, after the ...
linking Waterloo and
Charing Cross Charing Cross ( ) is a junction in Westminster, London, England, where six routes meet. Clockwise from north these are: the east side of Trafalgar Square leading to St Martin's Place and then Charing Cross Road; the Strand leading to the City; ...
. Digging commenced in 1865 but was halted in 1868 due to financial problems. In 1867 at the
American Institute Fair The American Institute Fair was held annually from 1829 until at least 1897 in New York City by the American Institute. The American Institute was founded in 1829 "for the encouragement of agriculture, commerce, manufactures, and the arts." The ...
in
New York New York most commonly refers to: * New York City, the most populous city in the United States, located in the state of New York * New York (state), a state in the northeastern United States New York may also refer to: Film and television * ...
, Alfred Ely Beach demonstrated a long, diameter pipe that was capable of moving 12 passengers plus a conductor. One year after New York City's first-ever elevated rail line went into service; in 1869, the Beach Pneumatic Transit Company of New York secretly constructed a long, diameter pneumatic subway line under
Broadway Broadway may refer to: Theatre * Broadway Theatre (disambiguation) * Broadway theatre, theatrical productions in professional theatres near Broadway, Manhattan, New York City, U.S. ** Broadway (Manhattan), the street **Broadway Theatre (53rd Stree ...
, to demonstrate the possibilities of the new transport mode. The line only operated for a few months, closing after Beach was unsuccessful in getting permission to extend it –
Boss Tweed William Magear Tweed (April 3, 1823 – April 12, 1878), often erroneously referred to as William "Marcy" Tweed (see below), and widely known as "Boss" Tweed, was an American politician most notable for being the political boss of Tammany ...
, a
corrupt Corruption is a form of dishonesty or a criminal offense which is undertaken by a person or an organization which is entrusted in a position of authority, in order to acquire illicit benefits or abuse power for one's personal gain. Corruption m ...
influential politician, did not want it to go ahead as he was intending to personally invest into competing schemes for an elevated rail line. ; 20th century In the 1920s, the Canadian Pacific and Canadian National Railways cooperated together to lay an elaborate system of 4,500 metre pneumatic tubing between four of their offices to Postal Station A at Union Station in Toronto, Canada. There was also a connection to the mail room at the Royal York Hotel. The newspapers the Star and Telegram joined into the system, laying pipes. In the 1960s, Lockheed and
MIT The Massachusetts Institute of Technology (MIT) is a private land-grant research university in Cambridge, Massachusetts. Established in 1861, MIT has played a key role in the development of modern technology and science, and is one of the m ...
with the
United States Department of Commerce The United States Department of Commerce is an executive department of the U.S. federal government concerned with creating the conditions for economic growth and opportunity. Among its tasks are gathering economic and demographic data for busi ...
conducted feasibility studies on a
vactrain A vactrain (or vacuum tube train) is a proposed design for very-high-speed rail transportation. It is a maglev (magnetic levitation) line using partly evacuated tubes or tunnels. Reduced air resistance could permit vactrains to travel at very hig ...
system powered by ambient atmospheric pressure and "gravitational pendulum assist" to connect cities on the country's East Coast. They calculated that the run between
Philadelphia Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since ...
and
New York City New York, often called New York City or NYC, is the most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the most densely populated major city in the Un ...
would average 174
meters per second The metre ( British spelling) or meter ( American spelling; see spelling differences) (from the French unit , from the Greek noun , "measure"), symbol m, is the primary unit of length in the International System of Units (SI), though its pre ...
, that is 626 km/h (388 mph). When those plans were abandoned as too expensive, Lockheed engineer L.K. Edwards founded Tube Transit, Inc. to develop technology based on "gravity-vacuum transportation". In 1967 he proposed a ''Bay Area Gravity-Vacuum Transit'' for California that would run alongside the then-under construction
BART Bart is a masculine given name, usually a diminutive of Bartholomew, sometimes of Barton, Bartolomeo, etc. Bart is a Dutch and Ashkenazi Jewish surname, and derives from the name ''Bartholomäus'', a German form of the biblical name ''Barth ...
system. It was never built. ; 21st century Research into trains running in partially evacuated tubes, such as the
Vactrain A vactrain (or vacuum tube train) is a proposed design for very-high-speed rail transportation. It is a maglev (magnetic levitation) line using partly evacuated tubes or tunnels. Reduced air resistance could permit vactrains to travel at very hig ...
and
Hyperloop A hyperloop is a proposed high-speed transportion system for both public and goods transport. The idea was picked up by Elon Musk to describe a modern project based on the vactrain concept (first appearance in 1799). Hyperloop systems compris ...
, is continuing.


Pneumatic elevator

A pneumatic elevato

consists of a cylindrical vertical shaft (typically made of transparent plastic), and a passenger capsule (also transparent) within the shaft which moves vertically by means of differential air pressure above and below. The main advantage that it requires neither a pit below or a loft above the shaft. For ascending operations, a vacuum pump at the top of the elevator shaft creates a low pressure by drawing air from above the capsule while below the greater normal atmospheric pressure is permitted to enter at the lower (ground floor) level below the capsule providing lift. To descend, electronically controlled valves inside the tubular shaft regulate the entry and exit of air within the cylinder lowering the car smoothly by means of programmed operation. In the event of a failure of the vacuum pump or electronically controlled valves, the trapped volume of air below the capsule acts as a cushion that is allowed to slowly escape by means of a mechanical valve, gently returning the capsule to the lowest level.


In money transfer

In large retail stores, pneumatic tube systems were used to transport sales slips and money from the salesperson to a centralized tube room, where
cashier A retail cashier or simply a cashier is a person who handles the cash register at various locations such as the point of sale in a retail store. The most common use of the title is in the retail industry, but this job title is also used in the ...
s could make change, reference credit records, and so on. Many banks with
drive-through A drive-through or drive-thru (a sensational spelling of the word ''through''), is a type of take-out service provided by a business that allows customers to purchase products without leaving their cars. The format was pioneered in the United ...
s also use pneumatic tubes.


In medicine

Many hospitals have pneumatic tube systems which send samples to
laboratories A laboratory (; ; colloquially lab) is a facility that provides controlled conditions in which scientific or technological research, experiments, and measurement may be performed. Laboratory services are provided in a variety of settings: physicia ...
. Blood preservations are transported, where weight and transport duration matter as well as preventing haemolysis caused by centrifugal and accelerating forces. Pneumatic tube systems are also used in hospitals to transport
X-rays An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10  picometers to 10 nanometers, corresponding to frequencies in the range 30  ...
, patient documents, general documents, drugs and test results. pneumatic tube systems have been shown to handle heavy liter-capacity IV bags with significantly fewer jams compared to the systems.


Department stores

To manage its mail order business the department store Sears built "massive warehouses, like its central facility in Chicago, in which messages to various departments and assembly workers were sent through pneumatic tubes". Many other department stores had pneumatic tube systems in the 20th century, such as Jacksons of Reading and Myer in Melbourne, Australia. The
National Library of Australia The National Library of Australia (NLA), formerly the Commonwealth National Library and Commonwealth Parliament Library, is the largest reference library in Australia, responsible under the terms of the ''National Library Act 1960'' for "mainta ...
's building (opened 1968), incorporates a pneumatic tube system for sending book requests from the reading rooms to the book stacks. The system is no longer used, but remains partially operational, and is demonstrated on behind the scenes tours.


Waste disposal

The use of pneumatic tubes in waste disposal units include the
Masjid al-Haram , native_name_lang = ar , religious_affiliation = Islam , image = Al-Haram mosque - Flickr - Al Jazeera English.jpg , image_upright = 1.25 , caption = Aerial view of the Great Mosque of Mecca , map ...
, Mecca, GlashusEtt in the Hammarby Sjöstad area of Stockholm, Sweden, Old Montreal, Canada, Disney World, Florida and Roosevelt Island and Hudson Yards, New York (US).


In production

Pneumatic tube systems are used in production plants. Uses include conveying spare parts, measuring instruments, tools or work pieces alongside
conveyor belt A conveyor belt is the carrying medium of a belt conveyor system (often shortened to belt conveyor). A belt conveyor system is one of many types of conveyor systems. A belt conveyor system consists of two or more pulleys (sometimes referred to ...
s or in the production process. In industrial laboratories samples are transported through the pneumatic tube systems. These can be conveyed in any physical state (solid, liquid, gas) and at any temperature. For example, the industrial company
ThyssenKrupp ThyssenKrupp AG (, ; stylized as thyssenkrupp) is a German industrial engineering and steel production multinational conglomerate. It is the result of the 1999 merger of Thyssen AG and Krupp and has its operational headquarters in Duisburg and ...
sends steel samples through pneumatic tubes at a rate of per second from the furnace to the laboratory.


Technical characteristics

Modern systems (for smaller, i.e. “normal”, tube diameters as used in the transport of small capsules) reach speeds of around per second, though some historical systems already achieved speeds of per second. At the same time, varying air pressures allow capsules to brake slowly, removing the jarring arrival that used to characterise earlier systems and make them unsuitable for fragile contents. Very powerful systems can transport items with a weight of up to and a diameter of up to . More than 100 lines and 1000 stations can be connected. Further, modern systems can be computer-controlled for tracking of any specific capsule and managing priority deliveries as well as system efficiency. With this technology, time-critical items can be transported, such as tissue samples taken during a
surgery Surgery ''cheirourgikē'' (composed of χείρ, "hand", and ἔργον, "work"), via la, chirurgiae, meaning "hand work". is a medical specialty that uses operative manual and instrumental techniques on a person to investigate or treat a pat ...
in a hospital. RFID chips within the capsules gather data – e. g. about the location of the carrier, its transport speed or its destination. The systems collect and save these data to help users optimize their internal processes and turnaround times. The facilities can be linked to the company's software systems, e.g. laboratory information systems, for full integration into company logistical management and production chains.


See also

*
Automated vacuum collection An automated vacuum waste collection system, also known as pneumatic refuse collection, or automated vacuum collection (AVAC), transports waste at high speed through underground pneumatic tubes to a collection station where it is compacted and se ...
* Lamson Engineering Company Ltd *
Pipeline transport Pipeline transport is the long-distance transportation of a liquid or gas through a system of Pipe (fluid conveyance), pipes—a pipeline—typically to a market area for consumption. The latest data from 2014 gives a total of slightly less than ...
* Prague pneumatic post, the world's last preserved pneumatic mail system *
Vactrain A vactrain (or vacuum tube train) is a proposed design for very-high-speed rail transportation. It is a maglev (magnetic levitation) line using partly evacuated tubes or tunnels. Reduced air resistance could permit vactrains to travel at very hig ...
* Cash carrier


References

* M. Marcu-Pipeline conveyors(pneumatic wheeled pipeline conveyors-state of the art/photos-1990) at page 45 in the "Material handling in pyrometallurgy": proceedings of the International Symposium on Materials Handling in Pyrometallurgy, Hamilton, Ontario, August 26–30, 1990 * Twigge-Molecey, T. Price, Metallurgical Society of CIM. Non-Ferrous Pyrometallurgy Section Pergamon Press, Sep 30, 1990 - Technology & Engineering - 227 pages


Further reading

* Archibald Williams, "Pneumatic Mail Tubes", in ''The Romance of Modern Mechanism'', Philadelphia: Lippincott, 1907. Reprinted by Nabu Press, 2010. .


External links


Site describing Pneumatic Trash and Linen Systems, with photos



"Dial Switches Message Tubes"
1951 article that describes with photos and drawing the basics of how the system operates

* ttps://web.archive.org/web/20070317212629/http://www.capsu.org/features/pneumatic_tube_system_in_prague.html Article describing the pneumatic post system in Prague
Pneumatic mail article
from the U.S.
National Postal Museum The National Postal Museum, located opposite Union Station in Washington, D.C., United States, covers large portions of the Postal history of the United States and other countries. It was established through joint agreement between the United ...

''The pneumatic dispatch...''
(1868) by Alfred Beach (scanned pages)
''Beach Pneumatic'' Alfred Beach's Pneumatic Subway and the beginnings of rapid transit in New York

Futuristics: Pneumatic Transportation
(contains historical illustrations)
Capsule Pipelines
good historical information, original author of info found on "capsu.org" pages.
Pneumatic Tube System - How it works


pneumatic tubes used for cash handling in shops {{Authority control Pipeline transport Postal systems Pneumatics Postal history