Richardson's handbook of projection (1930)

Record Details:

Title:
Richardson's handbook of projection
Date:
1930
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
00062
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
March 28, 2024
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986 HANDBOOK OF PROJECTION FOR (7) The illumination of the photo-electric cell. (8) The photo-electric cell current. (9) The voltage impressed on the loud speaker. (10) The vibration of the diaphragm of the loud speaker. "That, very briefly and without any technicalities at all, describes to you the process by means of which variable density sound is impressed upon the film, and supplies you with a view of that type of sound photographic impressions so magnified that you may have a competent understanding of just what the sound band impression lines really look like, though to the naked eye they appear merely as a series of fine lines, often almost entirely invisible. " Observe in Fig. 383, how light gradually shades into dark, or vice versa. That corresponds to or with the back-and-forth movement of the air transmitting the sound waves and the in-and-out movement of the microphone diaphragm, hence the more sudden the change from light to dark or dark to light, the more violent was the back-and-forth movement of the air at that instant of time, hence the greater the acoustic energy of sound. Conversely the less the contrast between light and dark, the softer was the sound recorded. In considering this you must differentiate between loudness and pitch. A high pitched sound may not be loud, neither is a low pitched sound necessarily a "low" sound. A base drum may make a lot of racket, whereas a child's whistle may be made to sound low.