Motion picture handbook; a guide for managers and operators of motion picture theatres (1910)

Page scan 00053 from Motion picture handbook; a guide for managers and operators of motion picture theatres

Record Details:

Title:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Date:
1910
Publisher:
New York : The Moving picture world
Volume:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Leaf #:
00053
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
Internet Archive
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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FOR MANAGERS AND OPERATORS 43 also put out with their machines a rheostat identical with the above except that it is non-adjustable and has casing, thus complying with Underwriters' rules. Let me say here that when using an adjustable rheostat Fig-. 20. on which appear the words "in" and "out" on opposite sides of the contacts, swinging the lever, or knob, towards the "in" cuts in more resistance and reduces the current. Swinging toward the "out" has, of course, the opposite effect. Before turning current on an adjustable rheostat for the first time, set the adjustment clear around to "in," then close switch and move the lever until you get the current you want. Fig. 21 shows two other rheostats put out with Powers machines. The smaller is well made and has a maximum capacity of 35 amperes on voltage ranging up to I20. The construction is first class, the contacts excellent and the adjustment ar- rangement very convenient. There are but two binding posts. Attach a wire to each is all the instruction necessary, setting the lever so that the resistance is all in before turning on current, of course. The larger machine may be used on voltage from 52 to 240. It is exceptionally well made and is quite light. The writer has found it par-excellent for road work. There are two binding-posts, one of which connects, of course, directly with the central adjustment lever post, and the other with the end of the coil opposite the post.