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 #:
000207
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:
August 22, 2024
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MAINTENANCE AND INSPECTION 187 pick up speed on starting, the tension on the main drive belt may be corrected by loosening the two locking screws on the motor base and dropping this base until the required tension is obtained. Care should be taken not to increase the tension abnormally, for this will result in putting undue strain on the belt. If, after a projector is started, the take-up lags, causing a looseness which the reel takes upj with a snap, then the take-up tension nut on the end of the take-up shaft should be adjusted. Do not run a machine without the film in place. Doing this to any extent may cause flat spots on the drum friction roller. B. Optical System The focus of the optical system and the adjustment of the lamp holder have been determined and set at the factory; therefore no further adjustment should be made other than the replacement of the iovolt prefocussed lamps. Care should be taken to see that the "eye" of the photocell is at all times lined up properly with the hole in the housing or shell. C. Amplifier Fuses All fuses are located on the rear of the amplifier, and their location is indicated on the panel. With the exception of the "Loudspeaker Fields" and "15-volt Generator" fuses, the fuse in any circuit may be checked by the meter reading obtained from the jack in that circuit. The fuses, together with ratings, jacks, and corresponding circuits, are given below: FUSE MARKING FUSE RATING JACK "Battery" 250V-60A EAX2 CIRCUIT Filaments of all tubes; plate volt "500 volts" 600V-1.8A EB123X100 age; voltage am plifier "1000 volts" 2300V-1.3A EB4-13X100 Plate voltage Power amplifier