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

Page scan 000933 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 #:
000933
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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898 HANDBOOK OF PROJECTION FOR afterward, without tracing it clear from the battery or bell. The use of three colors of wire simplifies matters very greatly. Suppose you get red, blue and white. You take one color, say, the blue, and run it from one (either) binding post of the battery to one (either) binding post of each bell. You may run separate wires from the battery binding post to each bell or run one wire reaching all bells or you may Q -Bill \ — i 3EZL T f^aVI 1 -J M 4 "33 L Figure 370. branch off to a bell at any point. Next take another color (red, for instance), and run from the other battery binding post to one (either) side of each push-button. You now have one side of the battery connected to one side of each bell and the other side of the battery connectd to one side of each push-button. You next, with the remaining color (white) wire, connect the remaining side of each pushbutton with the remaining side of the bell it is to ring, and the job is done. The blue wire (blue in this case) is called the common bell wire, the red wire is called the push-button wire and the whites are called the individual wires. It .is these latter wires which determine which bell a button will Figure 371.