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vibrations per second which produce a note of a given pitch. 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.]

An instrument consisting of a number of perforated gauges fastened together at one end by a rivet, -- used for ascertaining the size of pearls. Knight. Size roll, a small piese of parchment added to a roll. -- Size stick, a measuring stick used by shoemakers for ascertaining the size of the foot.

A vessel with a perforated cover, for sprinkling with a liquid; a sprinkler.

liquid; a device of the character of a sieve or of a filter; specifically, an openwork or perforated screen, as for the end of the suctionpipe of a pump, to prevent large solid bodies from entering with a liquid.

age upon the work, or the work upon the swage, and striking with a sledge. Swage block, a perforated block of iron, having grooved sides and adapted for use in heading bolts and swaging objects of large size.

ncludes an oscillograph, ralay, equilibrator, and an induction coil the sparks from which perforate a paper with tiny holes that form the image.

To perforate; to bore; to pierce. [R.] Sir T. Browne.

of brachiopods which includes many living and some fossil species. The larger valve has a perforated beak, through which projects a short peduncle for attachment. Called also lamp shell.

To perforate by a pointed instrument; to bore; to transfix; to drill. [Obs.] He pierced through his chafed chest With thrilling point of deadly iron brand. Spenser.

To bore through; to perforate. [Obs.]

To perforate (the skull) with a trepan, so as to remove a portion of the bone, and thus relieve the brain from pressure or irritation; to perform an operation with the trepan.

To perforate with a trephine; to trepan.

serpents, or Solenoglypha, and the cobralike serpents, or Proteroglypha. The former have perforated, erectile fangs situated in the front part of the upper jaw, and are without ordinary teeth behind the fangs; the latter have permanently erect and grooved fangs, with ordinary maxillary teeth behind them. -- Ven"om*ou…

A small perforated box for holding aromatic vinegar contained in a sponge, or a smelling bottle for smelling salts; -- called also vinegarette.

A ring of metal, leather, or other material, or a perforated plate, used for various purposes, as around a bolt or screw to form a seat for the head or nut, or around a wagon axle to prevent endwise motion of the hub of the wheel and relieve friction, or in a joint to form a packing, etc.

, recreation, boating, etc. -- Watering pot. (a) A kind of bucket fitted with a rose, or perforated nozzle, -- used for watering flowers, paths, etc. (b) (Zoöl.) Any one of several species of marine bivalve shells of the genus Aspergillum, or Brechites. The valves are small, and consolidated with the capacious calcare…

A plate or thin portion, continuous or perforated, connecting stiffening ribs or flanges, or other parts of an object. Specifically: --

in the middle of the hold of a fishing vessel, made tight at the sides, but having holes perforated in the bottom to let in water for the preservation of fish alive while they are transported to market.

r Bevel, Brake, etc. -- Core wheel. (Mach.) (a) A mortise gear. (b) A wheel having a rim perforated to receive wooden cogs; the skeleton of a mortise gear. -- Measuring wheel, an odometer, or perambulator. -- Wheel and axle (Mech.), one of the elementary machines or mechanical powers, consisting of a wheel fixed to…

A perforated steel die through which wires or tubes are drawn to form them.