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 #:
00019
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 9 RULE OF THUMB. The following formula, known as the "Rule of Thumb," is correct and is very convenient in aid of memory. In this formula, V equals volts, A amperes and O ohms. Re- membering that it is expressed as a fraction and that the line means "divided by" and that with the upper quantity eliminated the two lower should be multiplied together, just cover up the quantity desired and what remains will equal the quantity covered up. For instance: I wish to ascertain the resistance, knowing the amperage and voltage. I place my thumb over the "O" and see that V divided by A will give it. V O A To find the watts being consumed you simply multiply the voltage by the number of amperes flowing; as, for instance, we have 30 amperes at no volts. How many watts? no multiplied by 30 equals 3,300 watts. How many kilowatts is that? 3,300 divided by 1,000 equals 33/10 kilowatts. How many horsepower is it? One watt is 1/746 of a horse- power, the'refore 3,300 watts would equal 3,300 divided by 746 or 4 and 158/^3 horsepower.