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An ancient military engine for hurling stones and other missiles. Book scorpion. (Zoöl.) See under Book. -- False scorpion. (Zoöl.) See under False, and Book scorpion. -- Scorpion bug, or Water scorpion (Zoöl.) See Nepa. -- Scorpion fly (Zoöl.), a neuropterous insect of the genus Panorpa. See Panorpid. -- Scorpion…

die, for cutting the thread on a wooden screw. -- Screw dock. See under Dock. -- Screw engine, a marine engine for driving a screw propeller. -- Screw gear. See Spiral gear, under Spiral. -- Screw jack. Same as Jackscrew. -- Screw key, a wrench for turming a screw or nut; a spanner wrench. -- Screw machine. (a)…

he parts do not depend upon fastening outside of the machine itself. Self-contained steam engine. (a) A steam engine having both bearings for the crank shaft attached to the frame of the engine. (b) A steam engine and boiler combined and fastened together; a portable steam engine.

city, 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.

Designating an internal-combustion engine of a type resembling the Diesel engine in using as fuel heavy oil which is injected in a spray just before the end of the compression stroke and is fired without electrical ignition. The fuel is sprayed into an iron box (called a hot bulb or hot pot) opening into the combustion…

lated by a hand lever, for quickly and easily moving the reversing gear of a large marine engine into any desired position indicated by that of the hand lever, which controls the valve of the motor.

-- called also line, or main line. -- Shaft alley (Naut.), a passage extending from the engine room to the stern, and containing the propeller shaft. -- Shaft furnace (Metal.), a furnace, in the form of a chimney, which is charged at the top and tapped at the bottom.

ety requires. -- Shifting center. See Metacenter. -- Shifting locomotive. See Switching engine, under Switch.

To cause an engine or weapon to discharge a missile; -- said of a person or an agent; as, they shot at a target; he shoots better than he rides. The archers have . . . shot at him. Gen. xlix. 23.

sed in burrowing. -- Steam shovel, a machine with a scoop or scoops, operated by a steam engine, for excavating earth, as in making railway cuttings.

e than normally; specif., a valve, actuated by the governor, used in one system of marine-engine governing to connect both ends of the low-pressure cylinder as a supplementary control.

clamping a board to something, as a bench. -- Side lever, a working beam of a side-lever engine. -- Side-lever engine, a marine steam engine having a working beam of each side of the cylinder, near the bottom of the engine, communicating motion to a crank that is above them. -- Side pipe (Steam Engine), a steam or e…

The muffler of an internal-combustion engine.

acting or exerting force during strokes in one direction only; -- said of a reciprocating engine, pump, etc.

a tube bent like a siphon, but having the branches turned upward; specifically (Hydraulic Engineering), a pipe for conducting water beneath a depressed place, as from one hill to another across an intervening valley, following the depression of the ground. -- Siphon barometer. See under Barometer. -- Siphon bottle, a…

An engine for hauling the cable used in skidding logs.

A slide valve. Slide box (Steam Engine), a steam chest. See under Steam. -- Slide lathe, an engine lathe. See under Lathe. -- Slide rail, a transfer table. See under Transfer. -- Slide rest (Turning lathes), a contrivance for holding, moving, and guiding, the cutting tool, made to slide on ways or guides by screws o…

e roof or shed to protect besiegers; a testudo. [Obs.] They had also all manner of gynes [engines] . . . that needful is [in] taking or sieging of castle or of city, as snails, that was naught else but hollow pavises and targets, under the which men, when they fought, were heled [protected], . . . as the snail is in hi…

alve, a small valve opening into the atmosphere from the cylinder or condenser of a steam engine, to allow the escape of air when the piston makes a stroke; -- so called from the noise made by its action.

and some lunar. Bacon. Solar cycle. See under Cycle. -- Solar day. See Day, 2. -- Solar engine, an engine in which the energy of solar heat is used to produce motion, as in evaporating water for a steam engine, or expanding air for an air engine. -- Solar flowers (Bot.), flowers which open and shut daily at certain…