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

Page scan 000100 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 #:
000100
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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82 RICHARDSON'S BLUEBOOK OF PROJECTION Not over 600 volts. 0 30 Amps. I Cartridge fuse (ferrule contact). 31 60 " » ) Cartridge fuse (knife-blade contact) 61-100 101-200 201-400 ' 401-600 ' (68) An electric conductor of given diameter and composition, of commercial copper for example will carrV a fixed number of amperes only without overload. (69) But it is always possible that something such as a ground, "short" or rise in voltage will cause an abnormal current to flow and overload a circuit, setting up a bad and dangerous condition. TABLE NO. 5 Form 1. CARTRIDGE FUSE-FERRULE CONTACT 1 Rated Capacity. Amperes. A B C Voltage Length Over Terminals. Inches. Distance between Contact Clips. Inches. Width of Contact Clips. Inches. , Not over 0-30 31-60 a 2 o 3 fa 1 m 54' JJ>M 61-100 101-200 201-400 401-600 N 5V& E 7/8 S 85/g * 10H 4 5 6 m Not over / 0-30 31-60 £ 5 o 5/ fa 4 4^4 61-100 101-200 201-400 C3 | 9/8 fa 115* 6 1 I 154 (70) To guard against this we have the "fuse," which is a short piece of conductor made from an alloy that will melt at far lower temperature than copper. (/I) ine fuse is usually connected to both wires of a circuit, as shown in Fig. 22A, though in actual practice raw wire is seldom used. (72) Fuses will melt quickly at low temperature, when wires become overloaded and their