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Fire piston

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A piece of flash cotton is ignited by the sudden compression of a fire piston.
Demonstration of a fire piston

A fire piston, sometimes called a fire syringe or a slam rod fire starter, is a device of ancient origin which is used to kindle fire. It uses the principle of the heating of a gas (in this case air) by rapid and adiabatic compression to ignite a piece of tinder, which is then used to set light to kindling.[1]

Description and use

Modern fire piston made from 1/2" PVC pipe, wood dowel, and rubber o-ring

A fire piston consists of a hollow cylinder sealed at one end and open at the other. Sizes range in length from 3 to 6 inches (7.5 to 15 cm) with a bore about 0.25 inch (6-7 mm) in diameter, to 10 to 14 inches (25 to 35 cm) with a bore about 0.5 inch (14 mm) in diameter. A piston with an airtight circular seal is fitted into the cylinder. String packing, rubber gaskets, or grease are used to create an air-tight but slippery seal. At the end of the piston is a small cavity, where tinder can be attached without it being crushed during subsequent operations. The piston can be completely withdrawn from the cylinder for installation or removal of the tinder.

The piston (or cylinder) has a handle on the end to allow a firm grip to be applied to it, or a large enough surface area to strike it sharply without causing pain, while the cylinder (or piston) is braced or slammed against a hard surface. The compression of the air when the piston is quickly forced into the cylinder causes the interior temperature to rise sharply to over 400 °F (260 °C), the autoignition temperature of tinder. This is hot enough for the tinder on or in the piston face to ignite with a visible flash that can be seen, if the cylinder is made of translucent or transparent material. The piston is then quickly withdrawn, before the now-burning tinder depletes the available oxygen inside the cylinder. The smouldering tinder can then be removed from the face of the piston and transferred to a larger nest of tinder material. The ember is then fanned or blown upon vigorously to create a flame, at which time various stages of larger kindling can be added until built into a full-scale fire.

Ancient and modern versions of fire pistons have been made from wood, animal horns, antlers, bamboo, or lead.[dubious – discuss] Today, fire pistons are commonly constructed from wood, metal, or plastic. Do-it-yourself designs have become available using wood dowels, PVC and copper pipe, and rubber O-rings to build versions costing less than $2 USD each.

Principle of operation

A 19th-century glass-cylinder fire syringe with a metal piston to which the tinder is attached

Rapid compression of a gas increases its pressure and its temperature at the same time. If this compression is done too slowly the heat will dissipate to the surroundings as the gas returns to equilibrium with them. If the compression is done quickly enough, then there is no time for thermal equilibrium to be achieved. The absolute temperature of the gas can suddenly become several times that of its surroundings, increasing from the original room temperature of the gas to a temperature hot enough to set tinder alight. The air in the cylinder acts both as a source of heat and as an oxidizer for the tinder fuel.

The same principle is used in the diesel engine to ignite the fuel in the cylinder, eliminating the need for a spark plug as used in the gasoline engine. The principle of operation is closer to the hot bulb engine, an early antecedent to the diesel, since the fuel (tinder) is compressed with the gas, while in a diesel it is injected when the gas is already compressed and at the high temperature.

Fire pistons have a compression ratio of about 25 to 1. This compares with about 20:1 for a modern diesel engine, and between 7:1 and 11.5:1 for a gasoline engine. The fire piston is made deliberately narrow so that unaided human strength can exert enough force to compress the air in the cylinder to its fullest extent. To achieve a high compression ratio, the final compressed volume of the tinder and air must be small relative to that of the length of the piston tube. These two factors together mean that only a tiny amount of tinder can be lit by a fire piston, but this can be sufficient to light other tinder, and in turn to light a larger fire.

The tinders that ignite at a very low temperature work best. Easily combustible materials such as char cloth or amadou work well as tinder, and can hold an ember. In contrast, cotton fibers ignite at 455 °F (235 °C) and will flash brightly but do not hold an ember. The bright flash of light is sufficient for demonstration purposes, but will not start a persistent fire.

The construction of a hand-operated bicycle pump is very similar, except that the pump has valves and a hose to deliver compressed air as an output. In the case of the pump, the heating of the compressed air is an undesired side effect, and the mechanism and lubricants must be chosen to resist high peak temperatures.

History

Modern replica Cocobolo fire piston

Fire pistons have been used in South East Asia and the Pacific Islands as a means of kindling fire for years. They are found in cultures where the blow pipe is used as a weapon and this suggests they may have developed out of blow pipe construction.[original research?] Their use has been reported from Burma, the Malay Peninsula, Indo-China, Borneo, Sumatra, Java, Kalimantan, Sulawesi, the Philippines, Madagascar,[2] and South India.[3]

In the West, the first fire piston was made in 1745 by the Abbot Agostino Ruffo of Verona, Italy, who was making a pair of air guns for the king of Portugal, John V. While Ruffo was testing a gun's air pump for leaks by plugging its outlet with a scrap of wood, he noticed that, after he had pressurized the pump, the wood had been scorched. Subsequently he found that tinder was ignited by the pump. Ruffo made an apparatus to study the phenomenon further.[4] An 1876 article in the New York Times claimed that the modern fire piston was reinvented independently in the west through experiments with the air gun, and not modeled after Asian designs.[5]

It is recorded that the first fire piston made its wider debut in front of scientists in 1802,[6] and was patented in 1807 simultaneously in both England and France.[7] Fire pistons, or "fire syringes" as they were called then, were popular household tools throughout Europe during the early nineteenth century, until the safety match was invented in 1844.

The fire piston may have inspired Rudolf Diesel in his creation of the diesel engine around 1892.[8][9]

In the US, descriptions have been published for many years.[10][11][12]

See also

References

  1. ^ Manansala, Paul K. (2006-03-24). "Metallurgy, Southeast Asian (Glossary) Piston bellows". Retrieved 2007-05-28.
  2. ^ OGATA, Masanori; Yorikazu SHIMOTSUMA (October 20–21, 2002). "Origin of Diesel Engine is in Fire Piston of Mountainous People Lived in Southeast Asia". First International Conference on Business and technology Transfer. Japan Society of Mechanical Engineers. Retrieved 2007-05-28.
  3. ^ Raghavan, M. D. (July 1935). "The Fire-Piston in South India". Man. 35. Royal Anthropological Institute of Great Britain and Ireland: 104–106. JSTOR 2790717.
  4. ^ See:
  5. ^ "The Pneumatic Tinder-box" (PDF). New York Times. 9 October 1876. Retrieved 19 August 2009.
  6. ^ In 1802, a worker in St. Etienne, France, who had long been making improvements to air rifles, noticed that (1) when the gun was fired in the dark, it emitted a bright light, and (2) if there was lint present in the gun when the gun was pressurized, the lint would become scorched or even ignite. Word of these observations reached Messrs. Eynard, Haèz, and Gensoul, who confirmed them and publicized them. Joseph Mollet (1756–1829), a professor of physics in Lyon, learned of these facts and investigated them. In 1804, he presented his findings to the Academy of Lyon. See: In 1803, Marc-Auguste Pictet (1752–1825), a Swiss scientist and journalist who publicized the findings of British science, communicated Mollet's observations to Alexander Tilloch, editor of the Philosophical Magazine. William Nicholson, editor of Journal of Natural Philosophy, Chemistry and the Arts, claimed that the emission of light during the firing of an air gun had been noticed earlier in England by a "Mr. Fletcher", who had demonstrated the effect to Nicholson and his colleagues. The production of light during the discharge of an air gun was investigated by John Hart of England and found to be due to contamination; likewise, the French chemist Louis Jacques Thénard investigated the production of light during the compression of gases, and found that contamination was also responsible.
  7. ^ In 1806, a "Colonel Grobert", who probably was Jacques François Louis Grobert (1757-181?), a colonel in the French artillery, conceived a fire piston (briquet pneumatique, pneumatic lighter), but he had it fabricated by a professional maker of scientific instruments in Paris, "Dumotier" (variously spelled Dumoutier, Du Moutier, and Dumotiez). See:
    • Grobert (April 1806) "Moyen de produire des inflammations par l'air comprimé" (Means of producing ignitions by compressed air), L'Esprit des journaux, françois et étranger, 4 : 139–145.
    • Morelot, Simon, Histoire naturelle appliquée à la Chimie [Natural history applied to chemistry] (Paris, France: F. Schoell and H. Nicolle, 1809), vol. 1, p. 94. From page 94, footnote 1: " (1) Inventé par le colonel Grobert, exécuté par M. Dumotier. " ((1) Invented by Colonel Grobert, executed by Mr. Dumotier.)
    • Krehl, Peter O. K., History of Shock Waves, Explosions, and Impacts (Berlin, Germany: Springer Verlag, 2009), p. 273.
    In 1807, Robert Lorentz of Hammersmith, England, obtained a British patent for a fire piston on behalf of Grobert.
  8. ^ Diesel Story (Film). Prelinger Archives: Shell Oil. 1952. Retrieved 2007-02-16.
  9. ^ Gurstelle, William (2009). "Rudolf Diesel and the Fire Piston". Make. 19. Sebastopol, California: O'Reilly Media: 166–168. ISSN 1556-2336.
  10. ^ Smiley, Edwin (February 1915) "Primitive methods of making fire," Boys' Life, 4 (12) : 9.
  11. ^ Post, Augustus (September 1929) "The Landing Field: The Diesel engine," Boys' Life, 19 (9) : 44.
  12. ^ Spencer, Billie (March 1974) "Man and fire," Boys' Life, 64 (3) : 6.

Bibliography

  • Arbor Scientific, Tools That Teach, Fire Syringe P1-2020; http://www.arborsci.com/Data_Sheets/P1-2020_DS.pdf
  • Balfour, Henry (1907) "The fire piston," Annual Report of the Board of Regents of the Smithsonian Institution, pp. 565–598.
  • Fox, Robert (July 1969) "The Fire Piston and Its Origins in Europe", Technology and Culture, 10 (3) : 355–370.
  • Jamison, The Remarkable Firepiston Woodsmoke (1994) Menasha Ridge Press, Birmingham AL ISBN 0-89732-151-0
  • Jamison, Richard with Mel Deweese, "The remarkable fire piston" in: Richard and Linda Jamison, Primitive Skills and Crafts: An outdoorsman's guide to shelters, tools, weapons, tracking, survival, and more (New York, New York: Skyhorse Publishing, 2007), pp. 163–176.
  • Rowlands, John J. The Cache Lake Country (1947) ; W. W. Norton and Company, Inc., New York, NY
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