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Piston   /pˈɪstən/   Listen
noun
Piston  n.  (Mach.) A sliding piece which either is moved by, or moves against, fluid pressure. It usually consists of a short cylinder fitting within a cylindrical vessel along which it moves, back and forth. It is used in steam engines to receive motion from the steam, and in pumps to transmit motion to a fluid; also for other purposes.
Piston head (Steam Eng.), that part of a piston which is made fast to the piston rod.
Piston rod, a rod by which a piston is moved, or by which it communicates motion.
Piston valve (Steam Eng.), a slide valve, consisting of a piston, or connected pistons, working in a cylindrical case which is provided with ports that are traversed by the valve.






Collaborative International Dictionary of English 0.48








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"Piston" Quotes from Famous Books



... for development? The steam-engine is a machine of remarkable structure. It has had, in one sense of the term, a wonderful "evolution." It is based on certain principles, the foundation one of which is the expansibility of steam, and its ability, when confined in a cylinder, to give motion to a piston. The steam-engine was first used for pumping, then for turning machinery, then for propelling boats, and now its crowning department is seen in the locomotive. There is a plan, a likeness, a similarity, which runs through all steam-engines, whether they be found in the mine, ...
— Evolution - An Investigation and a Critique • Theodore Graebner

... his speech was inaudible to Mahony. Just behind him stood one of his brother-in-law's most arrant opponents, a butcher by trade, and directly John began to hold forth this man produced a cornet-a-piston and started to blow it. In vain did Mahony expostulate: he seemed to have got into a very wasps'-nest of hostility; for the player's friends took up the cudgels and baited him in a language he would have been sorry to imitate, the butcher blaring away unmoved, with the fierce ...
— Australia Felix • Henry Handel Richardson

... single drivers in the center, 9 ft. in diameter, and a four-wheeled bogie at each end. The driving wheels have no flanges. The bogie wheels are 4 ft. in diameter. The cylinders have a diameter of 161/2 in. and a piston stroke of 24 in. The boiler contains 180 tubes, and the total weight of the engine is 42 tons. These locomotives, constructed for 7 ft. gauge, have attained a speed of seventy-seven miles ...
— Scientific American Supplement, No. 643, April 28, 1888 • Various

... of cast-brass, with a piston made of two circular pieces of the same metal, each put into a strong leather cup, and bolted to the other. The bottoms of the cups being together, when the piston becomes loose in the barrels, and there is not sufficient ...
— Fire Prevention and Fire Extinction • James Braidwood

... of freight across the ocean. The engines of the locomotive and the ship are worked by the push of steam. A fire is built under a boiler. The water is boiled; the steam is shut in; the only way the steam can get out is by pushing the piston ahead of it; the piston is attached to machinery that makes the ...
— Common Science • Carleton W. Washburne


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