F. H. Richardson's bluebook of projection (1935)

Page scan 00091 from F. H. Richardson's bluebook of projection

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 #:
00091
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 73 means a very heavy intermittent unbalance of the load. If the projection room is supplied by a 3-wire circuit the projector lamps should always be connected to opposite sides of the circuit, especially where the power plant is a small one. (45) Officials of a small plant will, if they know their business, not only object to two projector arc lamps being connected to the same side, but may insist that they be connected to the outside wires thus being fed with 220 volt current. (46) If a. c. is used at the arc and power is taken through transformers there is little objection to connecting to outside wires. The total energy taken from the lines would be practically the same as though 110 volt transformers were used on each side. If current is taken through rheostats, the power company would A3 ft MP B IOHMf> a /O /IMP ±=A /Ti/s/r^ /OLC Figure 18 benefit by the greater power consumption. Here instead of using wattage equal to the amperage multiplied by the voltage of the neutral and one outside wire, the voltage of the two outside wires (twice that of the neutral and either outside wire) must be reduced to arc voltage. This indicates much waste power. Assuming a 3-wire supply to be 110-220, and that 70 amperes are used at the arc, the total wattage consumed by connecting to outside wire and the neutral would be