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 #:
000278
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:
June 04, 2024
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260 RICHARDSON'S BLUEBOOK OF PROJECTION outlined in Fig. 71. If preferred the fan may be located entirely outside the projection room. (66) The method may be utilized in either of two ways. The fan ordinarily may be used to ventilate the projection room by installing a speed control device so that it will operate at the required speed. The speed control must be so connected to the port shutter master control that when it is released it will instantly energize the fan to its full power. The other way, when there is no forced draft system, is to install a separate, smaller fan in the outlet duct for ventilation purposes only, using the large fan for emer F/RE P/QOOF CLOSET AIR. INLET /n\\ PROJECT! ON ROOM Figure 71 gencies like fire. In this case it will incur no operating expense nor will it suffer deterioration from wear. It has a distinct value as insurance against the possibility of panic in the event of fire. (67) To be effective the fan must be large enough to create a slight vacuum in the room ; therefore it must be arranged to permit the inlet opening shutters to close automatically as soon as the port shutter master control is released. An auxiliary switch should be provided to open the fan circuit when the port shutter master control is released normally, as at closing time.