Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

Record Details:

Title:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Date:
[c1916]
Publisher:
New York City, The Moving Picture World
Volume:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Leaf #:
000408
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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FOR MANAGERS AND OPERATORS 389 The two and three phase outfits do not require starting boxes, but should be equipped with double-throw starting switches which have only one side fused. When starting up the switch should first be closed to the unfused side. When the speed of the armature reaches normal the switch should be quickly thrown over to the running (fused) side. When the Plate 10, Figure 187. speed of the motor reaches normal, the starting box handle or the double-throw switch in running position, and the rheostat handle set as indicated by the white arrow, the projection machine switch may be closed and the arc struck as described under "Starting D. C. Compensarcs." The coupling between the motor and generator is marked to show the direction in which the armature should revolve. It should run clockwise as one faces the generator commutator. The direction of rotation of two-phase induction motors may be reversed by interchanging the two stator leads of the same phase. In the case of single or three phase motors it is only necessary to interchange any two leads. Operating Directions for Two-Lamp Outfits, both D. C. to D. C. and A. C. to D. C. — The motor of the two lamp outfits is started the same as the regular single-lamp outfits, directions for which have already been given. Have change-over switch (by change-o(ver switch the single pole double contact switch is meant) on the panel closed, and start the first lamp by closing the switch and striking the arc in the usual manner. When it is desired to change from one lamp to the other, open change-over switch while the first lamp is still burning, then close the