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The act driving forward or away; the act or process of propelling; as, steam propulsion.

Hence, any vessel; usually with some epithet descriptive of its use or mode of propulsion; as, pilot boat, packet boat, passage boat, advice boat, etc. The term is sometimes applied to steam vessels, even of the largest class; as, the Cunard boats.

between the others, gripped by horizontal driving wheels on the locomotive, as a means of propulsion on steep gradients.

(Elec. Railroads) Any car containing motors for propulsion. [U. S.]

wheels, and weighing unladen (that is, without water, fuel, or accumulators necessary for propulsion) not more than three hundred weight (336 lbs.).

The act of driving forward; propulsion; -- opposed to Ant: suction or Ant: traction. [R.]

A cycle for carrying four riders, so arranged that all the reders can assist in the propulsion.

cycle having five crank shafts and adapted for five riders, all of whom can assist in the propulsion.

ted by means of a screw. -- Screw propeller, a screw or spiral bladed wheel, used in the propulsion of steam vessels; also, a steam vessel propelled by a screw. -- Screw shell (Zoöl.), a long, slender, spiral gastropod shell, especially of the genus Turritella and allied genera. See Turritella. -- Screw steamer, a s…

om one under steam. Under steam and canvas signifies that a vessel is using both means of propulsion. (b) (Mil.) Provided with, or sheltered in, tents. -- Under fire, exposed to an enemy's fire; taking part in a battle or general engagement. -- Under foot. See under Foot, n. -- Under ground, below the surface of the…

cal trussed and covered frame supported by internal gas cells, and provided with means of propulsion and control. It was first successfully used by Ferdinand Count von Zeppelin.