F. H. Richardson's bluebook of projection (1935)

Page scan 000316 from F. H. Richardson's bluebook of projection

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000316
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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298 RICHARDSON'S BLUEBOOK OF PROJECTION Field Poles Poles of a magnet forming a magnetic field. As applied to motors and dynamos, they are the poles that form the field in which the armature of the dynamo or motor rotates. Field Rheostat ► A rheostatic resistance, usually adjustable, employed to control the flow of current through the field coil or coils of a dynamo motor. Generator A machine which transforms mechanical power into electrical power. Such machines are commonly termed "dynamos" if they produce d. c. ; "alternators'' if their output is a. c. Magnet In the ordinary acceptance of the term, it is a body of iron charged with magnetism and generating or having power to generate a magnetic field. It may be a "permanent" magnet (a polarized electro magnet), in which case the magnetic field is always present; it becomes an electro-magnet only when excited by the passage of current through wires wound around it. Permanent magnets usually are of steel; electro-magnets are generally of soft iron. Magnets, permanent or otherwise, may be made more powerful by passing current through coils of wire wound around them. Magnet Coil A coil composed of insulated wire wound upon an electro-magnet over which current is passed to "excite" it to greater magnetive power. Also called a "field coil." Magnet Core A bar of iron or a lamination of insulated, thin iron plates around which the magnet coil is wound.