The audio-visual handbook (1942)

Record Details:

Title:
The audio-visual handbook
Date:
1942
Publisher:
Chicago : Society for Visual Education, Inc.
Volume:
The audio-visual handbook
Leaf #:
000163
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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Types of Sound Aids for Schools 145 ditional copies may be prepared either by re-recording (dubbing) or by using duplicating processes similar to those applied to wax recordings. Photo Courtesy RCA Manufacturing Co., Inc. Recorder in Use These recorders are available in three general types, to accommodate almost any situation. There are small portable recorders which can be carried from one room or building to another as required. These small instruments are usually equipped to record on six-, eight-, ten-, or twelve-inch discs, at 78 revolutions per minute. The resulting records may be played on the recorder or on any standard phonograph. A larger semiportable or console-type recorder is built to accommodate all sizes of records up to sixteen-inch .transcription discs, and will record at either 78 or 33 1/3 revolutions per minute. The principal advantage of the slower speed of operation is that it permits recording about two and one-half times as long as the recording time at 78 r.p.m. on a recording disc of any given size. The chief limitation is that 33 1/3 r.p.m. recordings cannot be reproduced on standard phonograph equipment which revolves at 78 r.p.m. The third general type of instantaneous disc recorder is the recording attachment which is used with a school radio-sound system to record any sound which is being distributed over the sound system,