Richardson's handbook of projection (1927)

Record Details:

Title:
Richardson's handbook of projection
Date:
1927
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000537
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:
September 28, 2023
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MANAGERS AND PROJECTIONISTS 439 In Fig. 144, two of the coils are shown, and the method of their mounting is illustrated. To replace these coils it is only necessary to release them from the end insulator and stretch a new coil around over the insulators. The frame in Fig. 144 carries two coils, one on either side. The insulators are of porcelain. In Fig. 145 we see the general construction of one type of these rheostats illustrated, its cover cut in two, and in Fig. 146 another, the protecting cover being entirely removed. Figure 146. In Fig. 147 a type of cover is shown which is to be heartily commended. It provides for connecting the rheostat cover to the vent pipe, or to the outer air, by means of a pipe, thus carrying practically all the heat generated by the rheostat out of the projection room. In the rheostat illustrated in Fig. 145 the coils are controlled by a dial switch ; also each individual coil is protected by a plug fuse. This has the advantage that by removing any one of the fuses one coil is cut out of service and the capacity of the rheostat reduced