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

Page scan 000932 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 #:
000932
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 897 splices, Page 123, and should be soldered and wrapped with insulating tape. Never run your wires in a slipshod manner. Always do a job in a workmanlike way. Stretch the wires tightly and run them as they should be run. Loose, sagging wires advertise the poor workman. A, Fig. 369, shows series connection of batteries, which has the effect of raising the pressure approximately one volt for each battery added. B shows multiple connection, which increases amperage, but not the voltage, and C a seriesmultiple connection which increases both volts and amperes. A very common practice in theatres is to use what is known as the three-wire system of bell wiring. This system is the most economical in that it requires a comparatively small amount of wire for the installation of several bells. By its use any number of bells may be run with one battery, and each bell has its own individual push-button. No push Figure 369. button will ring any bell but its own. Put up the bells, buzzers, or lights, and the push-button wherever you wish them to be. Use two batteries, connecting the carbon of one to the zinc of the other. Get bell wire of three different colors. The installation is illustrated in Fig. 368, in which A-A-A are bells, B-B-B push-buttons, and C a two-cell dry battery. "The reason for three colors is to avoid mistakes and confusion and to be able to find any particular wire anywhere