Motion picture projection : an elementary text book (1928)

Record Details:

Title:
Motion picture projection : an elementary text book
Date:
1928
Publisher:
New York : Technical Book Company
Volume:
Motion picture projection : an elementary text book
Leaf #:
00019
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
September 21, 2023
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MOTION PICTURE PROJECTION 13 GLOSSARY OF ELECTRICAL AND MECHANICAL TERMS ACETATE. A salt formed by the action of acetic acid upon a base. ACTUAL HORSE POWER. The exact useful power given out by an engine; found by subtracting the power used by the machine itself from the indicated horse power. ACHROMATIC LENSES. The color effect caused by the chromatic aberration of a simple lens greatly impairs its usefulness. This may be overcome by combining into one lens a concave lens of flint glass and a convex lens of crown glass. ALIGN. To place or form in line. ALLOY. A mixture of two or more metals. ALTERNATING CURRENT. A current that changes its flow of direction so many times a second according to the construction of the alternator. Written A. C. AMMETER. An instrument used to measure the flow of amperes. AMPERE. The unit of current strength. AMPERE HOUR. The quantity of electricity passed by a current of one ampere in one hour. One ampere flowing for one hour. Two amperes flowing for one-half hour. One-half ampere flowing for two hours: all equal one ampere hour. ANCHOR BOLTS. Bolts used for fastening machines to their foundation. ANTI-FRICTION METAL. A tin-lead alloy like Babbitt metal. APERTURE. An opening of any description in a partition. ARC. The arc between two carbon electrodes slightly separated. ARC RECTIFIER. An apparatus used to change A. C. to D, C. ARMATURE. A collection of pieces of iron designed to be acted on by a magnet.