16-mm sound motion pictures : a manual for the professional and the amateur (1953)

Record Details:

Title:
16-mm sound motion pictures : a manual for the professional and the amateur
Date:
1953
Publisher:
New York : Interscience Publishers
Volume:
16-mm sound motion pictures : a manual for the professional and the amateur
Leaf #:
000261
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:
April 11, 2024
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LIGHT MODULATOR 245 CELL FILLED WITH NITROBENZENE FILLER HOLE Fig. 56. Kerr (Karolus) cell. I I Fig. 57. Fox-case movietone aeolight — a sound recording glow lamp. Glow lamps are rarely used in 16-mm recording today; they have given way to the dry galvanometer and to the light valve. (4) A Kerr (Karolus) cell — the application of signal currents to its plates causes a change in the amount of polarized light transmitted through the cell because of a twist in the plane of polarization (Fig. 56). Nitrobenzene is the fluid commonly used as the medium. This type of light modulator was ordinarily associated with variable -density recording and is very little used today. (5) A glow lamp — the application of signal current to a glow discharge lamp of suitable type causes a change in the intensity of the glow (Fig. 57). When the light is transmitted through a suitable optical system, a variable-density record is produced. This type of light modulator is little used today; "flashover" of the lamp usually changes the lamp output seriously, making accurate exposure control difficult. By appropriate optical design, any of the foregoing modulators may be used to provide either variable-density or variable-area recording. In the past, light valves were ordinarily associated with variable-density recording and galvanometers were associ