F. H. Richardson's bluebook of projection (1935)

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000270
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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252 RICHARDSON'S BLUEBOOK OF PROJECTION LIGHT &EAM Parts A A are two pieces of fairly stiff, fireproof, sound absorbing material from Y% to y2 inch thick, cut to fit snugly but not too tightly into the wall opening at either side of the wall. The surfaces of these plates, on the projection room side at least, should be inset just enough so that iron holding straps will be flush with the face of the wall, thus avoiding interference with the port fire shutter. The holding straps are merely to reinforce parts AA and keep them from warping. A second set of straps may be run up and down if it is thought necessary. Parts AA are secured to the straps by means of rivets. CC are two pieces of the same material as AA, but no less than one-half inch in thickness. Parts AA are held firmly against the edges of CC by bolts BB, which should be threaded into the inner strap to avoid possible interference of nuts, if used, with fire shutters. Parts DDD may be set into slots in parts CC which may be saw kerfs, or slots may be made by affixing strips of the material from which parts DDD are made to plates CC, separated to form the slots. Fig. 69 shows the construction plainly. First, build the entire device at the bench so that it will fit into the wall opening snugly and may be easily pulled out again. When it is finished, install it in position in the wall open FlGURE 69* *This construction is covered by patent, but its use is advised, even though a fee is demanded.