Motion picture projection; an elementary text-book (1921)

Record Details:

Title:
Motion picture projection; an elementary text-book
Date:
1921
Publisher:
New York, Theatre Supply Co.
Volume:
Motion picture projection; an elementary text-book
Leaf #:
00059
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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58 MOTION PICTURE PROJECTION ary transformer, showing the primary coil wound around one leg of the core and the secondary coil wound around the opposite leg. Fig. 1 When we close the circuit on the primary side of transformer the current passing through the primary coil magnetizes the iron core, this magnetism in turn induces an A. C. current in the secondary coil. So that while the primary and secondary coil are insulated from the core and from each other, there is a magnetic connection between both coils and core. If we turn back to the basic principle of induction the working principle of the transformer is made clear. If an A. C. current is passed through a conductor encircling a bar of soft iron, the iron will become a magnet and remain so just as long as current is passed through the conductor. If a bar of iron carrying a conductor around it,