International projectionist (Jan-Dec 1939)

Page scan 00025 from International projectionist

Record Details:

Title:
International projectionist
Date:
Jan-Dec 1939
Publisher:
New York : James J. Finn Publishing Corporation
Volume:
International projectionist (Jan-Dec 1939)
Leaf #:
00025
Language:
English
Collection:
Technical Journals
Format:
Books
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
International Projectionist presented the technology of cinema sound and image projection while addressing the issues and concerns of union projectionists. -- David Pierce, 2013
Date Added:
September 12, 2024
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1. The new integral gear box assembly which keeps the gears in the new Photophone soundhead running in an oil bath and makes gear failures virtually impossible. An oil indicator tells the projectionist when additional lubricant is required. 2. This is the mechanism which provides the new shock-proof drive for the rotary stabilizer in the new soundhead. Isolation of the constantspeed sprocket shaft and drive gear from the gear train and driving apparatus prevents gear backlash from being transmitted to the constant-speed sprocket. Absolute constancy of film speed is therefore assured. 3. The RCA rotary stabilizer which is an integral part of every Photophone soundhead r Its efficiency has been increased still further in the new sound systems by the use of a new shock-proof driving mechanism which isolates the stabilizer itself from all vibration or gear backlash. Film flows smoothly and steadily past the light source. 4. Two new developments in the Photophone soundhead are shown here. In the front is the double exciter lamp socket, which makes a spare lamp ready for immediate use by simply reversing the socket. Also shown is the mechanism for focusing and locking the optical system (right). The lens can be focused quickly and accurately by the projectionist and then locked securely in place.