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 #:
00094
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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76 RICHARDSON'S BLUEBOOK OF PROJECTION of switch may be used to connect a power using device quickly to either of two power sources. The power using device is connected with the center lug and the two power sources respectively to the two end clips. The action is obvious. Figure 20. (52) Such switches, either single or double throw, may be had with one, two, three or four poles— that is, knives or blades— and contacts. Several types of single throw switches are shown in Fig. 20 in which A is a single-throw double pole SPDT, B a single-throw triple pole SPTP switch and C and D are STDP switches with cartridge fuses attached. C has the knife and D