Pneumatic tube

From Wikipedia, the free encyclopedia

Pneumatic tubes, also known as capsule pipelines or Lamson tubes, are systems in which cylindrical containers are propelled through a network of tubes by compressed air or by vacuum. They are used for transporting physical objects.

1 History
2 Pneumatic Post
- 2.1 Historical uses of pneumatic post
3 Pneumatic transportation
4 Current usage
5 Pneumatic tubes in fiction
6 See also
7 External links

[edit] History

Pneumatics can be traced back to Hero of Alexandria in the 1st century AD. The Victorians used capsule pipelines to transmit telegraph messages, or telegrams, to nearby buildings from telegraph stations.

While they are commonly used for small parcels and documents - now most often used at banks or supermarkets - they were originally proposed in the early 1800s for transport of heavy freight. It was once envisioned that massive networks of these tubes might be used to transport people.

Image:Lamson Tube Pneumatic Carrier Delivery Vehicle.jpg

Lamson Tube Carrier (courtesy of Eagle Pneumatics, Inc.)

[edit] Pneumatic Post

Pneumatic tube letter from Berlin, Germany, 1902

Italian pneumatic post stamp, 1945

Pneumatic post or pneumatic mail is a system to deliver letters through pressurized air tubes. It was invented by the Scottish engineer William Murdoch in the 1800s and was later developed by the London Pneumatic Dispatch Company. Pneumatic post systems were used in several large cities starting in the second half of the 19th century, but were largely abandoned during the 20th century.

It was also speculated that a system of tubes might deliver mail to every home in the US. A major network of tubes in Paris was in use until 1984, when it was finally abandoned in favor of computers and fax machines. Today, in Prague, the Czech Republic, pneumatic tubes are still in operation. This "potrubní pošta" service was opened in 1899 and today covers approximately 60 kilometeres, delivering mail and small parcels.

Typical current applications are in banks and hospitals. Many large retailers (such as Home Depot or CostCo in the US) use pneumatic tubes to transport checks or other documents from cashiers to the accounting office. One system lists a speed of 10 m/s. [1]

Pneumatic post stations usually connected post offices, stock exhanges, banks and ministries. Italy was the only country to issue postage stamps (between 1913 and 1966) specifically for pneumatic post. Austria, France, and Germany issued postal stationery for pneumatic use.

[edit] Historical uses of pneumatic post

1853: linking the London Stock Exchange to the city's main telegraph station (a distance of 220 yards)
1865: in Berlin (until 1976), the Rohrpost, a system 400 kilometers in total length
1866: in Paris (until 1984, 467 kilometers in total length from 1934)
1875: in Vienna (until 1956)
1887: in Prague (until 2002 due to flooding), the Pražská potrubní pošta, [2] (in Czech, with pictures)
other cities: Munich, Rio de Janeiro, Hamburg, Rome, Naples, Milan, Marseilles, Boston, New York City, Philadelphia, Chicago, St. Louis

[edit] Pneumatic transportation

(Pneumatic Transportation here refers to the transporting of people inside pneumatic tubes; other forms of transportation that use pneumatics for propulsion are not considered.)

In 1812, George Medhurst first proposed, but never implemented, blowing passenger carriages through a tunnel.

Brunel built an atmospheric railway on an 83.7-kilometre section of the South Devon Railway between Exeter and Plymouth, England in the 19th century It was also tried on the London & Croydon Railway in 1845, but was soon abandoned.

In 1861, the London Pneumatic Despatch Company built a system large enough to move a person, although it was intended for parcels. The October 10, 1865 inauguration of the new Holborn Station was marked by having the Duke of Buckingham, the chairman, and some of the directors of the company blown through the tube to Euston (a five minute trip).

A 550 metre (m) pneumatic passenger railway was exhibited at the Crystal Palace in 1864. This was a prototype for a proposed Whitehall Pneumatic Railway that would have run under the River Thames linking Waterloo and Charing Cross. Digging was started in 1865 but was stopped in 1868 due to financial problems.

In 1867 at the American Institute exhibition in New York, Alfred Ely Beach demonstrated a 32.6 m long, 1.8 m diameter pipe that was capable of moving 12 passengers plus conductor. In 1869, the Beach Pneumatic Transit Company of New York constructed in secret a 95 m long, 2.7 m diameter pneumatic subway line under Broadway. The line only operated for a few months, closing after Beach was unsuccessful in getting permission to extend it. (Though widely believed to have been demolished to make way for the current subway system, some think the system may still exist buried beneath the city. An old pneumatic tunnel is seen in the theatrical movie Ghostbusters 2 and in the direct-to-video movie An American Tail: The Treasure of Manhattan Island.)

In the 1960s, Lockheed and MIT with the United States Department of Commerce did feasibility studies on a vactrain system powered by ambient atmospheric pressure and "gravitational pendulum assist" to connect cities on the East Coast of the US. They calculated that the run between Philadelphia and New York City would average 174 metres per second.

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 along side the then-under-construction BART system. It was never built.

[edit] Current usage

The technology is still used on a smaller scale. A large number of drive-up banks use pneumatic tubes to transport cash and documents between cars and tellers. Most hospitals have a 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. NASA's original Mission Control Center in Houston, Texas had pneumatic tubes connecting controller consoles with staff support rooms. Denver International Airport is noteworthy for the large number of pneumatic tube systems, including a 10-inch diameter system for moving aircraft parts to remote concourses, a 4-inch system for United Airlines ticketing, and a robust system in the parking toll collection system with an outlet at every booth.

[edit] Pneumatic tubes in fiction

The pneumatic tube train from Albert Robida's The Twentieth Century

When pneumatic tubes first came into use in the 19th century, they symbolized technological progress and it was imagined that they would be common in the future. Jules Verne's Paris in the 20th Century (1863) includes suspended pneumatic tube trains that stretch across the oceans. Albert Robida's The Twentieth Century (1882) describes a 1950s Paris where tube trains have replaced railways, pneumatic mail is ubiquitous, and catering companies compete to deliver meals on tap to people's homes through pneumatic tubes. Edward Bellamy's Looking Backward (1888) envisions the world of 2000 as interlinked with tubes for delivering goods. Michel Verne's An Express of the Future (1888) questions the sensibility of a transatlantic pneumatic subway. In Michel & Jules Verne's The Day of an American Journalist in 2889 (1889) submarine tubes carry people faster than aero-trains and the Society for Supplying Food to the Home allows subscribers to receive meals pneumatically.

Later, because of their use by governments and large businesses, tubes began to symbolize bureaucracy. In George Orwell's Nineteen Eighty-Four, pneumatic tubes in the Ministry of Truth deliver newspapers to Winston's desk containing articles to be "rectified". The movie Brazil, which has similar themes, also used tubes (as well as other anachronistic technology) to evoke the stagnation of bureaucracy. At the start of each episode of the 1999 television series Fantasy Island, a darker version of the original, bookings for would-be visitors to the Island were sent to the devilish Mr. Roarke via a pneumatic tube from a dusty old travel agency, making the tube seem not so much bureaucratic as sinister.

The failure of pneumatic tubes to live up to their potential as envisioned in previous centuries has placed them in the company of flying cars and dirigibles as ripe for ironic retro-futurism. The 1960s cartoon series The Jetsons featured pneumatic tubes that people could step into and be sucked up and swiftly spit out at their destination. In the animated television series Futurama, set in the 31st century, large pneumatic tubes are used in cities for transporting people, whilst smaller ones are used to transport mail. The tubes in Futurama are also used to depict the endless confusion of bureaucracy: an immense network of pneumatic tubes connects all offices in New New York City to the "Central Bureaucracy", with all the capsules being deposited directly into a huge pile in the main filing room, with no sorting or organisation.

But, sometimes a tube is just a tube, and not all pneumatic tubes in fiction are symbolic or meaningful beyond simply being interesting technology. In the James Bond film The Living Daylights, a supposed Soviet defector was smuggled across the Iron Curtain in an oil pipe-line via a modified pig. While not technically a pneumatic tube, the design of the transportation system in Logan's Run, in which cars traveled in elevated clear tubes, seems influenced by pneumatic tube aesthetics.

A sophisticated network of pneumatic tubes in 1940s Manhattan is seen in the film adaptation of The Shadow.

In the story of ABC's series Lost, Locke and Eko discover a functioning pneumatic tube system inside one of the Dharma Initiative stations, named "The Pearl." The tubes empty into a large pile in the middle of the jungle.

The Parisian pneumatic postal system is shown working in some detail in a montage from Truffaut's Stolen Kisses (1968).

In the 1997 Nickelodeon cartoon, "The Angry Beavers", pneumatic tubes are used by the beavers in their dam to send and receive letters and packages of various sizes.

Computer games Grim Fandango and Bioshock both feature an pneumatic tube messaging systems, as well as the "Succ-U-Bus" system in the Starship Titanic video game.