Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

Record Details:

Title:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Date:
[c1916]
Publisher:
New York City, The Moving Picture World
Volume:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Leaf #:
000320
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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FOR MANAGERS AND OPERATORS 301 Only the best possible results from a given amperage can be had when the crater is in precisely the right position with relation to the lenses, with the least possible interference by the lower carbon tip, and this condition can only be obtained by a very careful adjustment and setting of your carbons. Some interesting data and information may be found in the following tabulated results of experiments made by the editor. SET: FIVE-EIGHTH INCH CORED ABOVE AND BELOW. Current Through G. E. 50 Ampere Mercury Arc Rectifier on Lowest Notch. Approximate distance between carbon tips at their nearest Voltage at point. Arc. Amperage. 1/16" 40 33 1/16" 45 28 3/32" 50 2S*/2 1/8 " 55 22y2 3/16" 60 20 1/4 " Arc unstable. 65 5/16" Arc very unstable. 70 15 75 Arc went out. SET: FIVE-EIGHTH INCH CORED ABOVE AND THE SAME SIZE SOLID BELOW. Approximate distance between carbon tips at their nearest Voltage at point. Arc. Amperage. 1/32" 40 31 3/32" 45 2?y2 3/16" 50 24*/2 1/4 " 55 22^ 5/16" 60 3/8 " 7/16" 65 70 Arc very unstable and went out after five seconds. It was observed that with two new five-eighth inch cored carbons, in order to keep the arc voltage down to 50, and thus keep the amperage within reasonable bounds, it was necessary to separate the carbons \% inches for the first 15 to 30 seconds, after which the arc resistance gradually but rapidly rose, until a 50 volt, 25 ampere arc was had with as little as three-thirty-second inch separation at the nearest