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 #:
000161
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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OPERATING MANUAL 141 I. I -A SOUND UNIT This unit is used for film reproduction and consists of a cast-iron chamber divided into three compartments, for the exciting lamp, the film, and the cell. It includes two lamp brackets (one spare), the lens tube and stripper assembly, the film guide mechanism, the rheostat and ammeter for the exciting lamp, a green indicating lamp cap, and fire guard plates. II. 49-A AMPLIFIER This is a two-stage transformer-coupled amplifier designed to work between the photo-electric cell and the 701A apparatus unit. The vacuum tubes are mounted on a vibration-damping suspension to reduce microphonic action to a minimum. There are a rheostat and a milliammeter for the filament current, and two Durham grid leak resistances. This amplifier requires two 239-A vacuum tubes. III. 7OO-A APPARATUS UNIT AND CONTROL SWITCH This unit includes the film-disk switch, serves as a housing for the 49-A amplifier and the 701-A apparatus unit, and contains the interwiring between these units. The operation of the film-disk switch also connects the batteries to the 49-A amplifier and the photo-electric cell and lights the proper one of two indicating lamps mounted on the door of the unit. IV. LAMP HOUSE ADAPTERS The lamp house mounting on the 703-A bracket, and the distance between this mounting and the optical centre of a Simplex, Powers, or Motiograph head, when set on this bracket, are the same as on the Motiograph De Luxe Projector. Therefore, if the equipment replaces a Motiograph De Luxe pedestal, no adapter is required. However, if the equipment is to replace a Simplex, a Powers,