noun: the part of an engine that moves up and down to create power
noun: mechanical device that has a plunging or thrusting motion

Keely
"The maximum test was made to placing an iron weight of 580 lbs. on the extreme end of the long arm of the lever. To lift this weight required a pressure of 18,900 lbs. to the square inch counting the difference in the length of the two arms and the area of the piston. When Keely turned the valve-wheel leading from the receiver to the flexible tube and through it into the steel cylinder beneath the piston, simultaneously with the motion of his hand the weighted lever shot up against its stop a distance of several inches, as if the iron were cork. [Snell Manuscript - The Book, page 3]

Keely says: "In considering the operation of my engine, the visitor .... must abandon all thought of engines (such as conceived with pistons, eccentrics, or working with pressure.) "My system - both in the developing of this power and in every branch of its utilization is based and founded on sympathetic vibration. In no other way would it be possible to awaken or develop this force and equally impossible would it be to operate my engine upon any other principle. [Snell Manuscript - The Book, page 3]

In considering the operation of my engine, the visitor, in order to have even an approximate conception of its modus operandi, must discard all thought of engines that are operated upon the principle of pressure and exhaustion, by the expansion of steam or other analogous gas which impinges upon an abutment, such as the piston of a steam-engine. My engine has neither piston nor eccentrics, nor is there one grain of pressure exerted in the engine, whatever may be the size or capacity of it. [Keely, see Keelys Accomplishments]

Editor's Note: The original Keely Motor has two descending pistons.

See Also

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descending piston
Wave pistons of light
piston
heartbeat piston
Cosmic Piston