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 #:
00025
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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FOR MANAGERS AND OPERATORS 15 In using this table we must remember, however, that it applies for SHORT LEADS ONLY (see Table No. 3). As the length of a wire increases its total resistance increases, so that a No. 16 wire would not convey six amperes of current for a long dis- tance without drop in voltage due to resistance. If the lead be long a larger size must be used for a portion of the distance. In other words, if your lead be a long one, it will be necessary to use, for a portion of the distante, a size of wire capable of carrying something more than the amperage indicated in the table, else there will be "drop" of voltage and your lamps will not burn up to candle power. The following table gives the current allowance by the Na- tional Board of Fire Underwriters-for various sizes copper wire, figured on a non-heating basis and, with due allowance made for long leads, it will meet every requirement of either the operator or the electrician.