OTTO CYCLE n.
on engines consisting of the following operations: First stroke, suction into cylinder of explosive charge, as of gas and air; second stroke, compression, ignition, and explosion of this charge; third stroke (the working stroke), expansion of the gases; fourth stroke, expulsion of the products of combustion from the cy…
PERCUSSION n.
-- Percussion bullet, a bullet containing a substance which is exploded by percussion; an explosive bullet. -- Percussion cap, a small copper cap or cup, containing fulminating powder, and used with a percussion lock to explode gunpowder. -- Percussion fuze. See under Fuze. -- Percussion lock, the lock of a gun that…
POWDER n.
An explosive mixture used in gunnery, blasting, etc.; gunpowder. See Gunpowder. Atlas powder, Baking powder, etc. See under Atlas, Baking, etc. -- Powder down (Zoöl.), the peculiar dust, or exfoliation, of powder-down feathers. -- Powder-down feather (Zoöl.), one of a peculiar kind of modified feathers which sometime…
SELF-STARTER n.
A mechanism (usually one operated by electricity, compressed air, a spring, or an explosive gas), attached to an internal- combustion engine, as on an automobile, and used as a means of starting the engine without cranking it by hand.