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 #:
000675
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 669 latest improvement made in it, should prove of interest. THE TRANSVERTER The AC to DC Transverter is a vertical ball bearing motor generator consisting of an interpole direct current generator above and directly connected to a squirrel cage induction motor below. The vertical design lends itself well to the usually narrow confines of the average projection room, where most of these machines are installed. This because the floor space required comprises a circle only of about 19 in. to 21 in. in diameter, depending on the capacity of the machine. Such construction involves no change or adaptation of design, as the machine is built and intended for this purpose alone and is not in any respect a modification of power apparatus. The height and weight of the Transverter also varies with its capacity, the limits being from 33 in. to 45 in. and in weight 500 to 1500 lbs. ITS BEARINGS Ball bearings are used throughout and, as claimed by the manufacturers, there is no question but that when properly mounted they are highly efficient and durable, requiring only a minimum of care. Automobile engineering practice, where ball bearings have had some twenty years of successful application, can be credited for showing how to properly mount and care for such bearings.