International Review of Educational Cinematography (Jan-Dec 1932)

Record Details:

Title:
International Review of Educational Cinematography
Date:
Jan-Dec 1932
Publisher:
International Educational Cinematographic Institute
Volume:
International Review of Educational Cinematography (Jan-Dec 1932)
Leaf #:
000830
Language:
English
Collection:
Non-Theatrical Film
Format:
Periodicals
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:
Date Added:
September 21, 2023
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806 resistance of which to the rotation have been calculated in relation with the weight and lie of the disc with the object of forming a regular mechanical filter. The least tendency of the disc to oscillate is damped down by the presence of the felt cylinder. The amplifying part has been constructed with the greatest care in all its particulars. The power of amplification is sufficient to allow for good audition for a public of several hundred persons. It works off the A. C. mains, and the energy consumed is about 90 watts. The loud-speaker has been carefully planned, and no effort spared to obtain as natural a reproductions as possible. Nasal tone and roughness, present in many loudspeakers, owing to excess of low tones, have been eliminated, thus improving — in certain elements of the electro-acoustic scale of reproduction — the tone of the medium and high frequencies.