Journal of the Society of Motion Picture Engineers (1930-1949)

Page scan 000250 from Journal of the Society of Motion Picture Engineers

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000250
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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DISK RECORDS FOR DIRECT PLAYBACK 247 covered with reasonable uniformity. A volume range of approximately 55 db. is obtainable using the frequency range specified. The records have sufficient life for most purposes and when protected from dust, finger prints, and oxidation may be played seventy-five FIG. 1. Recording and reproducing system for broadcast studio use. or more times using the light-weight flexible pick-up shown. Usually a large number of playings is not required and no special care in handling the disks is ordinarily demanded. The MI 4887 recording head consists of a mechanical band-pass network terminated by a special mechanical resistance material. The DECIBELS III 4 ft o u» o (j ^^ ^* •^ • — — ' — ~~ == •^ ^+ ^x ^ — ^ ^ ^^^^ *>* +*' 0** FREQUENCY IN CYCLES PER SECOND FIG. 2. Frequency response recorder head (MI-4887} optical measurement, lateral stylus velocity. impedance of the moving system is such that the motion of the cutting stylus is practically unaffected by the impedance of the record composition. This permits a free-space microscopic measurement of the performance of the head, which is duplicated almost exactly when cutting a record. The frequency response characteristics of two types