Society of Motion Picture Engineers : incorporation and by-laws (1919)

Page scan 000121 from Society of Motion Picture Engineers : incorporation and by-laws

Record Details:

Title:
Society of Motion Picture Engineers : incorporation and by-laws
Date:
1919
Publisher:
Washington D.C. : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1919)
Leaf #:
000121
Language:
English
Subjects:
motion pictures, Cinematography -- Periodicals
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Preceeded by an unnumbered issue published in 1916 called: Incorporation and by-laws
Date Added:
September 12, 2024
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alternating current can be purchased in sufficient quantity so that the easiest and most economical means of obtaining direct current is to purchase alternating current power and convert it. Converting apparatus will be described later in this paper. II. TWO-WIRE vs. THREE-WIRE DISTRIBUTION A two-wire system is one in which a single voltage is generated and a three-wire system is one in which two separate single equal voltages are transmitted which may be additively combined to produce a third voltage. With the two-wire system, as the name implies, only two wires are required. With the three-w4re system, three wires are required for main distribution. On a three-wire distribution system, one wire known as the "neutral" is common to both the equal voltage circuits and carries only the unbalanced current in the system. By unbalance is meant the difference in amperes flowing in the two equal voltage circuits. The other two wires, known as the outside wires, carry their proportional part of the total current in the system, whether balanced or unbalanced. 2f-00A +• /c 2 Wire nC Sysfem. /2 '"^^ /ZOOA. j sV. + /i \ /20OA. SV. 3 W/re a a System. 23