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 #:
000213
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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MANAGERS AND PROJECTIONISTS 1137 RCA Photophone Pick-up THE RCA Photophone sound pick-up system includes (a) an exciting lamp; (b) a condenser lens approximately one inch in diameter; (c) a slit; (d) a small objective lens; (e) a sound gate and aperture, and (f) a photo-electric cell, all mounted in a metallic casing which may be had shaped for attachment to any of the present makes of professional motion picture projectors. The exciting lamp is contained in a separate compartment of the said attachment. Its interior is shown photographically in Fig. 413. In the exciting lamp compartment is a rotating base or table, the action of which is controlled by hand wheel D, Fig. 413. Mounted on the rotating table or base are three lamp sockets, in each of w7hich it is designed that a lamp will be kept mounted, ready for instant use, so that in case an exciting lamp fails during the running of a show, it is only necessary to move hand wheel (D) one-third of a turn to bring another pre-adjusted lamp into use. Electric contact for the lamp is provided as follows : Examining Fig. 413 you will see a wire, X, at the right. This is one of the wires of the electric circuit supplying current for the exciting lamp, the other wire being hidden from view. Looking closely you wrill see two bars of copper alloy, C and C, to which the circuit wires are connected through the side of the compartment housing, being of course insulated from the metal thereof. At A