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h the adjacent pipes or ports may be made to communicate; formerly used as a valve in the steam engine, and now for various other purposes. In the illustration, a leads to the upper end of a steam engine cylinder, and b to the lower end; c is the steam pipe, and d the exhaust pipe.

The plaited hemp used for packing a piston, as of the steam engine and its pumps.

of barometer for determining the relative elasticities of the vapor in the condenser of a steam engine and the air. -- Water gauge. (a) A contrivance for indicating the height of a water surface, as in a steam boiler; as by a gauge cock or glass. (b) The height of the water in the boiler. -- Wind gauge, an instrument…

r, a mortise gear, or its skeleton. See Mortise wheel, under Mortise. -- Expansion gear (Steam Engine), the arrangement of parts for cutting off steam at a certain part of the stroke, so as to leave it to act upon the piston expansively; the cut-off. See under Expansion. -- Feed gear. See Feed motion, under Feed, n.…

ally held or adjusted by means of a wedge, key, or screw. Gib and key, or Gib and cotter (Steam Engine), the fixed wedge or gib, and the driving wedge,key, or cotter, used for tightening the strap which holds the brasses at the end of a connecting rod.

A contrivance applied to steam engines, water wheels, and other machinery, to maintain nearly uniform speed when the resistances and motive force are variable.

en out and replaced with the key; -- called also the hopper. Grove. Grasshopper engine, a steam engine having a working beam with its fulcrum at one end, the steam cylinder at the other end, and the connecting rod at an intermediate point. -- Grasshopper lobster (Zoöl.) a young lobster. [Local, U. S.] -- Grasshopper w…

A football field. Gridiron pendulum. See under Pendulum. -- Gridiron valve (Steam Engine), a slide valve with several parallel perforations corresponding to openings in the seat on which the valve moves.

formations, marches, and alignments in tactics. Farrow. Guide bar (Mach.), the part of a steam engine on which the crosshead slides, and by which the motion of the piston rod is kept parallel to the cylinder, being a substitute for the parallel motion; -- called also guide, and slide bar. -- Guide block (Steam Engine…

d fluid, is made to perform work by giving motion to mechanism, as a hot-air engine, or a steam engine. -- Heat producers. (Physiol.) See under Food. -- Heat rays, a term formerly applied to the rays near the red end of the spectrum, whether within or beyond the visible spectrum. -- Heat weight (Mech.), the product…

condensing or a noncondensing engine. Formerly the term was used only of the latter. See Steam engine.

t my flying sails. Pope. Hoisting him into his father's throne. South. Hoisting engine, a steam engine for operating a hoist.

g the power required to drive machinery, and in estimating the capabilities of animals or steam engines and other prime movers for doing work. It is the power required for the performance of work at the rate of 33,000 English units of work per minute; hence, it is the power that must be exerted in lifting 33,000 pounds…

From without inward; toward the inside; as, the inboard stroke of a steam engine piston, the inward or return stroke.

To investigate the condition or power of, as of steam engine, by means of an indicator.

-- Injection pipe, the pipe through which cold water is through into the condenser of a steam engine.

s of blubber on deck. -- Junk ring. (a) A packing of soft material round the piston of a steam engine. (b) A metallic ring for retaining a piston packing in place; (c) A follower. -- Junk shop, a shop where old cordage, and ship's tackle, old iron, old bottles, old paper, etc., are kept for sale. -- Junk vat (Leathe…

The amount of retardation of anything, as of a valve in a steam engine, in opening or closing.

Lap weld, a lap joint made by welding together overlapping edges or ends. -- Inside lap (Steam Engine), lap of the valve with respect to the exhaust port. -- Outside lap, lap with respect to the admission, or steam, port.

ooth, as a tooth of a wheel, in impelling another tooth or a pallet. Saunier. Lead angle (Steam Engine), the angle which the crank maker with the line of centers, in approaching it, at the instant when the valve opens to admit steam. -- Lead screw (Mach.), the main longitudinal screw of a lathe, which gives the feed m…