Handbook of projection for theatre managers and motion picture projectionists ([1922])

Page scan 000510 from Handbook of projection for theatre managers and motion picture projectionists

Record Details:

Title:
Handbook of projection for theatre managers and motion picture projectionists
Date:
[1922]
Publisher:
New York, Chalmers
Volume:
Handbook of projection for theatre managers and motion picture projectionists
Leaf #:
000510
Language:
English
Collection:
Books
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
14
Date Added:
July 19, 2022
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MANAGERS AND PROJECTIONISTS 475 generator field rheostat. The instruments have black faced dials and white pointers. The starters for the induction motors are either quick-make and break switches, Fig. 161, or type A auto starters, Fig. 162. Starting rheostats are furnished with the D. C.-D. C. motor generators. These equipments are designed to supply current for two arcs operating in independent parallel circuits, with a stabilizing adjustable ballast rheostat in each circuit. This arrangement has a decided advantage in that each arc operates entirely independent of the other; hence, if one arc should "break" while being adjusted for the next reel, the other arc Figure 160. Control Panel. Front and Side Views. will be in no way affected. Furthermore, any fluctuations of current in one arc circuit are not accompanied by corresponding fluctuations of current in the other arc circuit. This arrangement also provides for simultaneously operating arcs of different current strength ; for instance, an arc for a stereopticon requiring 25 amperes, and an arc for a spot light requiring 50 amperes. HEATING.— See General Instruction No. 10. INSTALLATION UNPACKING.— (See General Instruction No. 1). When uncrating the equipment, protect the various units against severe shocks and blows, especially if the temperature of the air be very low. Do not remove the blocking between tbe generator and motor frames until the set is finally installed at its permanent location. Furthermore, these