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 #:
00089
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:
August 01, 2024
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ELECTRICAL CONDUCTORS 71 taking current through rheostat B from a circuit attached to one of the house circuits. (34) When this system is charged with ordinary commercial voltage, we may draw circuits from the street mains at any point, or we may attach motors, lamps and other equipment to wires connected with the mains at any required point. The wires, switches, fuses, etc., must be large enough to carry the current without overload. Three-Wire System The 3-wire system is the most widely used for distribution of current for light, heat and power. It is diagrammatically illustrated in Fig. 17. (35) It is based on the principle that if two generators are connected in series — that is to say the positive pole of one is joined to the negative pole of the other — the voltage of the two generators will be added together, so that lines attached t"»*>. Jtw * J6l> jZl-j \ r jk> 7e <h, Figure 17 to the outer negative and the outer positive will be charged at double the voltage of each generator considered singly. Thus: (36) if two 110 volt generators are joined, the outside negative and positive would have a potential difference of 220 volts. (37) If we attach a third wire to the connection between the inner generator poles, C, Fig. 17, then that line (termed the "neutral" wire) will act as positive for one generator as if there were but one generator and negative for the other