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

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 #:
000106
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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88 RICHARDSON'S BLUEBOOK OF PROJECTION Asbestos covered wire strands usually are No. 30 or 31. By combining these strands a temporary fuse of almost any desired capacity can be made. Five strands would be approximately right to carry 40 amperes. A temporary fuse made thus would be more reliable, we believe, than would a single larger wire. TABLE NO. 7 APPROXIMATE FUSING POINT OF SMALL COPPER WIRES No. Amperes No. Amperes No. Amperes 30 ... .. @ . 10 25 ... .. @ . 25 21 ... .. @ . 50 28 ... .. @ . 15 24 ... .. @ . 30 20 ... .. @ . 60 26 ... .. @ . 20 23 ... ... @ . 40 18 ... .. @ . .... 70 When Fuses Blow (86) If a fuse lets go and the new one blows immediately after it is installed this is positive proof that something is wrong. It is probably a "short" or heavy ground. Leave the circuit dead until the trouble has been located and repaired. (87) Should the new fuse blow only after a lapse of time it is possible that the trouble is due to poor contact. (88) This points to the necessity for examining fuses at intervals because they readily generate heat when loose or dirty. (89) Fuses used on a 110 volt current must be inspected regularly. Often a rise in voltage will force enough additional current through to blow a fuse. The danger is instantly obvious because all incandescent lamps will burn above normal brilliancy. Where Fuses Are Installed (90) In general, fuses should be installed as follows: (a) Main service fuses, located on the street side of the main house switch. These fuses carry all current used in the theatre except exit and other lights ordinarily kept burning while the performance is in progress, and the stage lights where the stage is served by a separate service circuit, (b) All circuits supplying emergency lights including exit lights and those lights kept burning