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A flattened marine univalve shell of the genus Haliotis; -- called also sea-ear. See Abalone.

t the center of the wheel and that of the shaft do not coincide. It is used for operating valves in steam engines, and for other purposes. The motion derived is precisely that of a crank having the same throw. Back eccentric, the eccentric that reverses or backs the valve gear and the engine. -- Fore eccentric, the ec…

ll (Zoöl.), one in which a transverse line drawn through the apex of the umbo bisects the valve, or divides it into two equal and symmetrical parts. -- Mutually equilateral, applied to two figures, when every side of the one has its equal among the sides of the other.

of the mind between motives or reasons, with consequent indecision and doubt. Equilibrium valve (Steam Engine), a balanced valve. See under Valve.

Same as Equivalve or Equivalved.

A bivalve shell of the genus Pecten. See Scallop.

Escape pipe (Steam Boilers), a pipe for carrying away steam that escapes through a safety valve. -- Escape valve (Steam Engine), a relief valve; a safety valve. See under Relief, and Safety. -- Escape wheel (Horol.), the wheel of an escapement.

The depression behind the beak of certain bivalves; the ligamental area. Escutcheon of pretense, an escutcheon used in English heraldry to display the arms of the bearer's wife; -- not commonly used unless she an heiress. Cf. Impalement.

e (Anat.), a passage from the tympanum of the ear to the pharynx. See Ear. -- Eustachian valve (Anat.), a crescent-shaped fold of the lining membrane of the heart at the entrance of the vena cava inferior. It directs the blood towards the left auricle in the fetus, but is rudimentary and functionless in the adult.…

osphere or to the condenser. Exhaust port (Steam Engine), the opening, in the cylinder or valve, by which the exhaust steam escapes. -- Exhaust purifier (Milling), a machine for sorting grains, or purifying middlings by an exhaust draught. Knight. -- Exhaust steam (Steam Engine), steam which is allowed to escape from…

holding a locomotive frame to the boiler while allowing lengthwise motion. -- Expansion valve (Steam Engine), a cut-off valve, to shut off steam from the cylinder before the end of each stroke.

The scar to which the adductor muscle is attached in oysters and other bivalve shells; also, the adductor muscle itself, esp. when used as food, as in the scallop.

The valve of a pump box.

also tap, and cock. It consists of a tubular spout, stopped with a movable plug, spigot, valve, or slide.

A marine univalve shell of the genus Pyrula, or Ficula, resembling a fig in form.

ses. Flap tile, a tile with a bent up portion, to turn a corner or catch a drip. -- Flap valve (Mech.), a valve which opens and shuts upon one hinged side; a clack valve.

ch.), a siliceous stone used to rub stonework or brickwork to a smooth surface. -- Float valve, a valve or cock acted upon by a float. See Float, 1 (b).

aving a solid piston, or plunger, for drawing and forcing a liquid, as water, through the valves; in distinction from a pump having a bucket, or valved piston.

Allowing passage in either of four directions; as, a four-way cock, or valve. Francis. Four-way cock, a cock connected with four pipes or ports, and having two or more passages in the plug, by which the adjacent pipes or ports may be made to communicate; formerly used as a valve in the steam engine, and now for various…

red by a strange black obscurity: it is the frost smoke of arctic winters. Kane. -- Frost valve, a valve to drain the portion of a pipe, hydrant, pump, etc., where water would be liable to freeze. -- Jack Frost, a popular personification of frost.