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harnessed one before the other. "He drove tandems." Thackeray. Tandem engine, a compound steam engine having two or more steam cylinders in the same axis, close to one another. -- Tandem bicycle or tricycle, one for two persons in which one rider sits before the other.

A steam engine having two or more steam cylinders in line, with a common piston rod.

The throttle valve. Throttle lever (Steam Engine), the hand lever by which a throttle valve is moved, especially in a locomotive. -- Throttle valve (Steam Engine), a valve moved by hand or by a governor for regulating the supply of steam to the steam chest. In one form it consists of a disk turning on a transverse axi…

e radius of a crank, or the eccentricity of an eccentric; as, the throw of the crank of a steam engine is equal to half the stroke of the piston.

Shak. Triple crown, the crown, or tiara, of the pope. See Tiara, 2. -- Triple-expansion steam engine, a compound steam engine in which the same steam performs work in three cylinders successively. -- Triple measure (Mus.), a measure of tree beats of which first only is accented. -- Triple ratio (Math.), a ratio whi…

A large pipe forming the piston rod of a steam engine, of sufficient diameter to allow one end of the connecting rod to be attached to the crank, and the other end to pass within the pipe directly to the piston, thus making the engine more compact.

Provided with trunnions; as, the trunnioned cylinder of an oscillating steam engine.

or reduction of pressure below that of the atmosphere, in a vessel, as the condenser of a steam engine, which is nearly exhausted of air or steam, etc.; as, a vacuum of 26 inches of mercury, or 13 pounds per square inch. Vacuum brake, a kind of continuous brake operated by exhausting the air from some appliance under e…

ithin and without. -- Valve chest (Mach.), a chamber in which a valve works; especially (Steam Engine), the steam chest; -- called in England valve box, and valve casing. See Steam chest, under Steam. -- Valve face (Mach.), that part of the surface of a valve which comes in contact with the valve seat. -- Valve gear…

or quantity of water, or for indicating the height of its surface, as in the boiler of a steam engine. See Gauge.

f bournonite so named from the shape of its twin crystals. See Bournonite. -- Wheel pit (Steam Engine), a pit in the ground, in which the lower part of the fly wheel runs. -- Wheel plow, or Wheel plough, a plow having one or two wheels attached, to render it more steady, and to regulate the depth of the furrow. -- W…

n, the hand drops. It is chiefly due to plumbism. Called also hand drop. -- Wrist plate (Steam Engine), a swinging plate bearing two or more wrists, for operating the valves.