Richardson's handbook of projection (1930)

Page scan 000229 from Richardson's handbook of projection

Record Details:

Title:
Richardson's handbook of projection
Date:
1930
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000229
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:
August 01, 2024
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MANAGERS AND PROJECTIONISTS 1153 Back View of RCA Photophone Loudspeaker Mounting. Fig. 417. Two of a bank of RCA Photophone moving coil cone loudspeakers mounted in a rack for theatre installation. Notice the angular location of the cones with respect to the front face of the rack. The upper cone is set at forty-five degrees and the lower cone at fifteen degrees. Connections are made to cables running in two pipe conduits at the side, as can be seen in the illustration. It will be noticed that adjusting rods and springs ("A") are located along three of the spiders comprising the frame of the loudspeakers. These rods connect with fine cords which are tied together at the center of the cone apex to keep the cone centrally located in the assembly. Adjustment to the central setting is made by means of the rods. This is done only by RCA Photophone service engineers.