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 #:
000681
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 675 there that trouble will first develop if there is anything lacking in either its design or the quality of the material used. In the Transverter commutator cold drawn copper bars are used, which insure absolute uniformity of density and temper of metal throughout, and these bars, as well as the mica segments, are punched to exact uniformity of size, and all are assembled between mica end rings into a steel core under many tons of hydraulic pressure, thus eliminating any possibility of warpage or loosening of bars in service. BRUSHES AND HOLDERS r The brush-holders are of brass and of the most modern type, having adjustable tension fingers that hold in contact with the commutator surface the carbon brushes, which are electrically connected to the brush-holder castings with flexible pigtails, thus minimizing losses and eliminating any possibility of the joints or tension springs being injured by such currents. INTERCHANGEABILITY The various parts of Transverters of any given size are interchangeable, and while it is seldom that anything more than a set of brushes is required by a user, the interchangeability of the parts is of advantage to the manufacturer in assembly of the machines, and insures that in event that a user should have need for any part, it may be obtained almost immediately from the nearest Transverter dealer.