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ch. The sounds are produced by a perforated rotating disk or disks. A form with two disks operated by steam or highly compressed air is used sounding an alarm to vessels in fog. [Written also sirene, and syren.]

That which operates by sliding. Specifically:

To cause to close suddenly, as the parts of a trap operated by a spring; as, to spring a trap.

ing or regulating flow, as of a liquid in a pipe; -- in distinction from a valve which is operated by the action of the fluid it restrains. -- Stop watch, a watch the hands of which can be stopped in order to tell exactly the time that has passed, as in timing a race. See Independent seconds watch, under Independent,…

Any instruments of action; an apparatus by which an object is moved or operated; gear; as, fishing tackle, hunting tackle; formerly, specifically, weapons. "She to her tackle fell." Hudibras.

A hydraulic device by which the movement of the wheel on the bridge operates the steering gear at the stern.

Relating to thermodynamics; caused or operated by force due to the application of heat. Thermodynamic function. See Heat weight, under Heat.

ither way at all times of the tide; - - called also guard lock. -- Tide mill. (a) A mill operated by the tidal currents. (b) A mill for clearing lands from tide water. -- Tide rip, a body of water made rough by the conflict of opposing tides or currents. -- Tide table, a table giving the time of the rise and fall of…

One who operates a tilt hammer.

A person who operates a typewriting machine; a typewriter.

To work or operate in secret or clandestinely. B. Jonson.

tions. -- Unlimited pump, a kind of deep-well pump placed at the level of the water, and operated from above ground. -- Un*lim"it*ed*ly, adv. -- Un*lim"it*ed*ness, n.

inches of mercury, or 13 pounds per square inch. Vacuum brake, a kind of continuous brake operated by exhausting the air from some appliance under each car, and so causing the pressure of the atmosphere to apply the brakes. -- Vacuum pan (Technol.), a kind of large closed metallic retort used in sugar making for boili…

A mill operated by the power of the wind, usually by the action of the wind upon oblique vanes or sails which radiate from a horizontal shaft. Chaucer.

One who pulls the wires, as of a puppet; hence, one who operates by secret means; an intriguer. Political wire-pullers and convention packers. Lowell.

Hence, in a general sense, to operate; to act; to perform; as, a machine works well. We bend to that the working of the heart. Shak.