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

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 #:
00045
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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10 HANDBOOK OF PROJECTION FOR mutator section F instead of commutator section E; but since brush C now rests on commutator section F instead of E, the current, while reversed in the coil itself, will still flow in the same direction over the outside circuit, so that we shall have "direct current" everywhere except in the armature of the dynamo itself. This is called "commutation." Please understand that in Fig. 2 we illustrate the principle involved in commutation only. In modern dynamo armatures there are many coils and commutator sections, bars or segments, as they are variously called, but regardless of complications the principle involved is exactly what we have described. See Hawkins' Electrical Guides, Vol. 1, pages 171 to 180, for a detailed description of the action. Figure 3