Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Date:
1914
Author:
Gage, Simon Henry, 1851-1944
Publisher:
Ithaca, N.Y. : Comstock Publishing Company
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Leaf #:
000530
Language:
English
Subjects:
Lantern projection, Motion picture projection
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
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CH. XIII] SWITCHES, FUSES, CIRCUIT BREAKERS SIS FIG. 276. SNAP AND KNIFE SWITCHES SHOWING OPEN AND CLOSED CIRCUIT. A Snap switch with circuit closed (current on). B Knife switch with circuit closed (current on). C Snap switch with circuit open (current off). D Knife switch with circuit open (current off). A W Wires from the switch to the arc lamp. Base The insulating support of the knife switch. H Handle of the switch blades. L W Supply wires for the electric current to the switch. There are two main forms of switches: The knife switch like that shown in fig. 276 B, D, and the snap switch, which rotates (fig. 276 A, C). Any switch to be installed should conform in its construction with the National Electric Code and be plainly marked with its capacity — voltage and amperage — and the maker's name. § 712. Installation of a switch. — The non-combustible, nonconducting base should be fastened to some support, and then the wires of the line cut and scraped and connected firmly in the binding posts or under the binding screws. If the current is over 30 amperes the wires should also be soldered to the switch after the screws are well set down. A switch at the supply for the building