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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 motion…

of others. -- Leading wheel, a wheel situated before the driving wheels of a locomotive engine.

rtical rod lifted by a rock shaft, and imparting motion to a puppet valve; -- used in the engines of river steamboats. -- Lifting sail (Naut.), one which tends to lift a vessel's bow out of water, as jibs and square foresails.

t of parts, not as to design or proportion, but with reference to smooth working; as, the engine is in line or out of line or out of line.

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.

ve by an adjustable connecting bar, called the link, in such a way that the motion of the engine can be reversed, or the cut-off varied, at will; -- used very generally in locomotives and marine engines.

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.

A locomotive engine; a 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 lo…

A record and tabulated statement of the work done by an engine, as of a steamship, of the coal consumed, and of other items relating to the performance of machinery during a given time.

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.

To increase the power of (a single-cylinder beam engine) by adding a small high-pressure cylinder with a piston acting on the beam between the center and the flywheel end, using high-pressure steam and working as a compound engine, -- a plan introduced by M'Naught, a Scottish engineer, in 1845.

The working parts of a machine, engine, or instrument; as, the machinery of a watch.

A constrictor of machines and engines; one versed in the principles of machines.

gth, 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 brace…

A military engine formerly used for throwing stones and javelins.

An optical device for making an indicator diagram for high- speed engines. It consists of a light-tight box or camera having at one end a small convex mirror which reflects a beam of light on to the ground glass or photographic plate at the other end. The mirror is pivoted so that it can be moved in one direction by a…

ion or naval affairs; nautical; as, marine productions or bodies; marine shells; a marine engine.

In an internal-combustion engine with two or more cylinders, an induction coil and vibrator placed in the circuit between the battery or magneto and the coils for the different cylinders, which are used without vibrators of their own.

effective power; useful work exerted, as by a machine, in a definite time. -- Mechanical engineering. See the Note under Engineering. -- Mechanical maneuvers (Mil.), the application of mechanical appliances to the mounting, dismounting, and moving of artillery. Farrow. -- Mechanical philosophy, the principles of mec…

fish. Cadet midshipman, formerly a title distinguishing a cadet line officer from a cadet engineer at the U. S. Naval Academy. See under Cadet. -- Cadet midshipman, formerly, a naval cadet who had served his time, passed his examinations, and was awaiting promotion; -- now called, in the United States, midshipman; in…