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e membrane records the movements of the latter, as it vibrates, upon a moving cylinder or plate.

ith some material easily indented, as tinfoil, wax, paraffin, etc., above which is a thin plate carrying a stylus. As the plate vibrates under the influence of a sound, the stylus makes minute indentations or undulations in the soft material, and these, when the cylinder or disk is again turned, set the plate in vibrat…

An electrotype plate formed in a mold made by photographing on prepared gelatine, etc.

The process of obtaining an etched or engraved plate from the photographic image, to be used in printing; also, a picture produced by such a process.

engrave, or make an engraving of, by any photomechanical process involving etching of the plate.

A photo-engraving produced by any process involving the etching of the plate.

, steel, or zinc, by means of the action of light and certain chemicals, so that from the plate impressions may be taken. Sir D. Brewster.

An instrument for determining the sensibility of the plates employed in photographic processes to luminous rays.

An arrangement of two photographic cameras, the plates of which may be brought into exactly the same plane, used in surveying and map making. From the differences between two pictures taken at the same moment, measurements in all dimensions of the region may be obtained.

A plate or block with a printing surface (usually in relief) obtained from a photograph; also, any one of the many methods of processes by which such a printing surface is obtained.

alogous to photolithography, for reproducing photographed impressions transferred to zinc plate.

nathus, and allied genera, having a long and very slender angular body, covered with bony plates. The mouth is small, at the end of a long, tubular snout. The male has a pouch on his belly, in which the incubation of the eggs takes place.

The distance between the centers of holes, as of rivet holes in boiler plates. Concert pitch (Mus.), the standard of pitch used by orchestras, as in concerts, etc. -- Diametral pitch (Gearing), the distance which bears the same relation to the pitch proper, or circular pitch, that the diameter of a circle bears to its…

ides or currents. Pitching piece (Carp.), the horizontal timber supporting the floor of a platform of a stairway, and against which the stringpieces of the sloping parts are supported.

An extra plate on the lower part of the breastplate or backplate. Planché.

t group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus.

A division of ganoid fishes including those that have large external bony plates and a cartilaginous skeleton.

Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.

ivision of gastropod Mollusca, including the chitons. The back is covered by eight shelly plates. Called also Polyplacophora. See Illust. under Chiton, and Isopleura.

A European food fish (Pleuronectes platessa), allied to the flounder, and growing to the weight of eight or ten pounds or more.