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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.

king down of the roof of a gallery under its superincumbent weight. Thrust bearing (Screw Steamers), a bearing arranged to receive the thrust or endwise pressure of the screw shaft. -- Thrust plane (Geol.), the surface along which dislocation has taken place in the case of a reversed fault.

st, a sob arose. Jeffrey. At intervals there came some tremendous thud on the side of the steamer. C. Mackay.

ce of assembly, or of passage in a public conveyance; as, a theater ticket; a railroad or steamboat ticket.

A steamer used for towing other vessels; a tug.

The business done upon a railway, steamboat line, etc., with reference to the number of passengers or the amount of freight carried. Traffic return, a periodical statement of the receipts for goods and passengers, as on a railway line. -- Traffic taker, a computer of the returns of traffic on a railway, steamboat line…

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.

A gudgeon on each side of an oscillating steam cylinder, to support it. It is usually tubular, to convey steam. Trunnion plate (Gun.), a plate in the carriage of a gun, mortar, or howitzer, which covers the upper part of the cheek, and forms a bearing under the trunnion. -- Trunnion ring (Gun.), a ring on a cannon nex…

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

bivalve mollusk. Capillary tube, a tube of very fine bore. See Capillary. -- Fire tube (Steam Boilers), a tube which forms a flue. -- Tube coral. (Zoöl.) Same as Tubipore. -- Tube foot (Zoöl.), one of the ambulacral suckers of an echinoderm. -- Tube plate, or Tube sheet (Steam Boilers), a flue plate. See under Flu…

, composed wholly of tubulous florets; as, a tubulous compound flower. Tubulous boiler, a steam boiler composed chiefly of tubes containing water and surrounded by flame and hot gases; -- sometimes distinguished from tubular boiler.

A small, powerful steamboat used to tow vessels; -- called also steam tug, tugboat, and towboat.

use to flow by turning a valve, stopcock, or the like; to give passage to; as, to turn on steam. -- To turn one's coat, to change one's uniform or colors; to go over to the opposite party. -- To turn one's goods or money, and the like, to exchange in the course of trade; to keep in lively exchange or circulation; to…

A narrow superstructure running from stem to stern on the upper deck of a steam cargo vessel having a rounded gunwale and sides curved inward convexly.

has pretty, fragrant, pendulous flowers borne in pairs on a slender stalk. -- Twin-screw steamer, a steam vessel propelled by two screws, one on either side of the plane of the keel.

Moved or propelled by sails; -- said of any vessel with her sail set, but especially of a steamer using her sails only, as distinguished from 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…

The pipe leading upward from the smoke box of a steam boiler to the chimney, or smokestack; a flue leading upward.

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…