Handbook of projection for theatre managers and motion picture projectionists ([1922])

Page scan 00068 from Handbook of projection for theatre managers and motion picture projectionists

Record Details:

Title:
Handbook of projection for theatre managers and motion picture projectionists
Date:
[1922]
Publisher:
New York, Chalmers
Volume:
Handbook of projection for theatre managers and motion picture projectionists
Leaf #:
00068
Language:
English
Collection:
Books
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
14
Date Added:
July 19, 2022
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MANAGERS AND PROJECTIONISTS 33 electro-magnet only when "excited" by passing a current of electricity over wires wound around it. Magnets, either permanent or otherwise, may be made more powerful by passing an electric current over wires coiled around them. MAGNET COIL. — A coil of insulated wire wound around an electro-magnet, over which current is passed in order to increase the density of the magnetic field produced by the magnet. Also called "Field Coils." MAGNET CORE. — The bar of iron or steel around which the magnet coil is wound. MAGNETIC DENSITY.— The number of lines of magnetic force passing through a magnetic field per unit of cross section area. MAGNETIC FIELD. — (a) The space immediately surrounding the poles of a magnet through which the magnetic force acts. It is strongest near the surface of the magnet poles, decreasing rapidly in strength with distance, finally disappearing entirely, (b) The space immediately surrounding any wire conveying alternating current. MAGNETIC FLUX.— The average intensity of a magnetic field multiplied by its area. The total strength of a magnetic field. MAINS. — A term variously used, but commonly designating the wires of the principal distribution circuits of an electric system. MAINS, STREET.— The wires of the street circuit which supplies the house service wires. MAT. — In projection, the paper mask used to outline the photograph of a stereo slide. MEAN SPHERICAL CANDLE POWER.— The average spherical candle power. MELTING POINT.— The temperature at which substances begin to melt or fuse. An alloy consisting of one part tin and one part lead, melts at from 375 to 460 degrees. Tin melts at from 442 to 446 degrees. Lead melts at from 608 to 618 degrees Silver melts at from 1733 to 1873 Copper melts at from 1929 to 1996 " Steel melts at from 2372 to 2532 Wrought Iron melts at from 2732 to 2912 MENISCUS. — A lens which is convex en one surface and concave on the other. METER. — The unit of length in the metric system. Equals 39.37 inches.