Motion picture handbook; a guide for managers and operators of motion picture theatres (1910)

Record Details:

Title:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Date:
1910
Publisher:
New York : The Moving picture world
Volume:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Leaf #:
00032
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
Internet Archive
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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22 MOTION PICTURE HANDBOOK "live" end, and not posts 3 and 4. The "live end" means the end attached to the supply, the other end being "dead" (not charged) when the switch is open. In the case of the oper- ating room arc lamp switch the live end would be attached to the wires coming from the main house switchboard. In the main house switch it would be the end attached to the wires entering the building. FIG. 7 B. Contacts d-d, Fig. 6, must be kept as tight as may be without unduly binding the action of the switch. Unless these contacts are kept snug they will heat more or less, moreover the switchbars will "wabble" and won't strike contacts c-c squarely when closing. Always keep the con- nections between the handle crossbar (e, Fig. 6) tight. A loose, wabbly switch indicates a slovenly workman. In pur- chasing switches LOOK CAREFULLY TO THE LAST NAMED CONNECTIONS. In some makes of switches this joint is very poorly made and causes constant trouble, par- ticularly in the smaller switches. INVARIABLY OPEN A SWITCH WITH A QUICK JERK, especially if it be one carrying heavy current. This reduces the arcing. Arcing roughens and injures the con- tacts and the less there is of it the better.