Sound motion pictures : from the laboratory to their presentation (1929)

Record Details:

Title:
Sound motion pictures : from the laboratory to their presentation
Date:
1929
Publisher:
Garden City : Doubleday, Doran & Company, Inc.
Volume:
Sound motion pictures : from the laboratory to their presentation
Leaf #:
000106
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
March 28, 2024
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86 SOUND MOTION PICTURES the other two. Each switch connects the associated batteries for charging or for operating, according to the wayit is thrown, as marked on the panel. On A. C. supply a charger is used to rectify the A. C. and deliver D. C. of the proper voltage for charging the different batteries. Putting either of the switches for the A and H batteries in the charging position automatically starts up that part of the charger which supplies current for these batteries. The charger has a control for regulating the A and H battery charging rate. This control must be kept set at the point indicated by the engineer. When both B battery switches are in the charging position the charger is automatically connected for charging the B batteries. When the upper B battery switch and one of the F battery switches are both at "charge " the charger supplies F battery charging current. On D. C. supply charging, current controls are used for regulating the charging rate for the A, H, and F batteries. These controls must be kept set at the point indicated by the engineer. The charging rate for the B batteries on either A. C. or D. C. supply is controlled by a fixed resistor enclosed in the upper part of the panel box. This resistor does not require any attention on the part of the operator. Meters are provided for reading the charging current through the A and H batteries, the B battery and the F battery. The A and H batteries are so connected that the charging rate through each unit is one half the reading on the meter. The operator will not ordinarily need to read any of these meters, as they are principally intended to assist the engineer in adjusting the charging current controls. The panel has the following fuses: Plate Circuit — One 3-ampere cartridge fuse on the positive side of 130 V; and one in the positive side of 350 V. Line Circuit — Two 30-ampere cartridge fuses.