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ce or motion, especially a short connecting rod with a bearing at each end; specifically (Steam Engine), the slotted bar, or connecting piece, to the opposite ends of which the eccentric rods are jointed, and by means of which the movement of the valve is varied, in a link motion.

The work done by a steam engine or other prime mover when working. Load line, or Load water line (Naut.), the line on the outside of a vessel indicating the depth to which it sinks in the water when loaded.

self-propelling wheel carriage, especially one which bears a steam boiler and one or more steam engines which communicate motion to the wheels and thus propel the carriage, -- used to convey goods or passengers, or to draw wagons, railroad cars, etc. See Illustration in Appendix. Consolidation locomotive, a locomotive…

Having, employing, or exerting, a low degree of pressure. Low- pressure steam engine, a steam engine in which low steam is used; often applied to a condensing engine even when steam at high pressure is used. See Steam engine.

strength, by sheer strength; as, to lift a heavy weight by main strength. -- Main beam (Steam Engine), working beam. -- Main boom (Naut.), the boom which extends the foot of the mainsail in a fore and aft vessel. -- Main brace. (a) (Mech.) The brace which resists the chief strain. Cf. Counter brace. (b) (Naut.) The…

oncommissioned officers, privates, and musicants of marines. -- Marine engine (Mech.), a steam engine for propelling a vessel. -- Marine glue. See under Glue. -- Marine insurance, insurance against the perils of the sea, including also risks of fire, piracy, and barratry. -- Marine interest, interest at any rate ag…

to change place or posture; susceptible of motion; not fixed or stationary; as, a movable steam engine.

working of any complex machine; as, the cylinder, valves, crank, etc., are organs of the steam engine.

That oscillates; vibrating; swinging. Oscillating engine, a steam engine whose cylinder oscillates on trunnions instead of being permanently fixed in a perpendicular or other direction. Weale.

orce its outward way. Dryden. -- Out"ward*ly, adv. -- Out"ward*ness, n. Outward stroke. (Steam Engine) See under Stroke.

hout giving passage to air, water, or steam; as, to pack a joint; to pack the piston of a steam engine.

r fitting within a cylindrical vessel along which it moves, back and forth. It is used in steam engines to receive motion from the steam, and in pumps to transmit motion to a fluid; also for other purposes. Piston head (Steam Eng.), that part of a piston which is made fast to the piston rod. -- Piston rod, a rod by wh…

id, as steam, water, etc., may pass, as from a valve to the interior of the cylinder of a steam engine; an opening in a valve seat, or valve face. Air port, Bridle port, etc. See under Air, Bridle, etc. -- Port bar (Naut.), a bar to secure the ports of a ship in a gale. -- Port lid (Naut.), a lid or hanging for closi…

light and portable my pain seems now! Shak. Portable forge. See under Forge. -- Portable steam engine. See under Steam engine.

pressure, Center of pressure, etc. See under Atmospheric, Center, etc. -- Back pressure (Steam engine), pressure which resists the motion of the piston, as the pressure of exhaust steam which does not find free outlet. -- Fluid pressure, pressure like that exerted by a fluid. It is a thrust which is normal and equall…

ce, and apply them to drive other machines; as a water wheel, a water- pressure engine, a steam engine, a hot-air engine, etc. (c) Fig.: The original or the most effective force in any undertaking or work; as, Clarkson was the prime mover in English antislavery agitation. -- Prime number (Arith.), a number which is ex…

annon. -- Priming valve (Steam Eng.), a spring safety valve applied to the cylinder of a steam engine for discharging water carried into the cylinder by priming. -- Priming wire, a pointed wire used to penetrate the vent of a piece, for piercing the cartridge before priming.

a. & n. from pump. Pumping engine, a steam engine and pump combined for raising water. See Steam engine.

nd opens by moving bodily away from the seat while remaining parallel with it, -- used in steam engines, pumps, safety valves, etc. Its edge is often beveled, and fits in a conical recess in the seat when the valve is closed. See the valves shown in Illusts. of Plunger pump, and Safety valve, under Plunger, and Safety.…

f the hairspring, and thus regulates the vibrations of the balance. (b) The governor of a steam engine. (c) A valve for controlling the admission of steam to the steam chest, in a locomotive.