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 #:
00061
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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RESISTANCE 43 Extra Resistance (48) Should a rheostat be somewhat lacking in amperage capacity, it is an easy matter to cut out one coil or grid by loosening the inside connection of a coil and clamping the circuit wire under it instead of connecting it to the binding post — provided such cut-out does not raise the temperature of the remaining coils or grids beyond the safety limit. If, on the other hand, too much amperage is supplied, an extra coil may be mounted on porcelain insulators attached to a non-inflammable support, with the circuit wire connected to one end and the other to the rheostat binding post. This is illustrated Figure 11 in Fig. 11, in which wire B shows how a defective coil C may be cut out temporarily. Also, at A, how additional resistance may be connected into series. Rheostat Connections (49) Rheostats may be connected in series or in parallel, the series type of connection being shown in Fig. 6, and the parallel (also termed "multiple") in Fig. 7. (50) In the series connection the current must pass through the entire length of the resistance elements of both rheostats, hence the total resistance (in two 2-ohm rheostats) would be 4 ohms.