Motion picture projection : an elementary text book (1928)

Record Details:

Title:
Motion picture projection : an elementary text book
Date:
1928
Publisher:
New York : Technical Book Company
Volume:
Motion picture projection : an elementary text book
Leaf #:
000703
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
September 21, 2023
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MOTION PICTURE PROJECTION 697 placed in their proper place. Should the coupling be taken apart, it must be assembled carefully, making sure that the halves fit properly. Diagram Fig. 290 shows the external connections for the 35 amperes two-lamp series outfit. Fig. 291 shows the external connections for the 50 and 70-ampere two-lamp series outfit, using only a switch between the line and the motor end of the machine on the two-phase and three-phase circuits. The use of a double throw switch having one side fused for running and the other unf used for starting is generally acceptable to the power companies for motors of five horse-power and smaller. If the power companies or the local conditions require a starting compensarc, the motor end of the two and three-phase compensarc should be connected to the line in accordance with the diagrams Fig. 292 and Fig. 293 respectively. The wiring should be of sufficient size so that the line drop from the machine to the lamp will not exceed one volt, or two per cent of the voltage when the machine is delivering full-load current to the lamp. If too small a wire is used the lamp will be robbed of some of its voltage and give poor light. The lamp side of these machines does not require fuses, as the generators are so constructed that they will protect themselves against overload current when the arcs are short circuited. The motor side of the various machines should be fused as follows: