Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Date:
1914
Author:
Gage, Simon Henry, 1851-1944
Publisher:
Ithaca, N.Y. : Comstock Publishing Company
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Leaf #:
00099
Language:
English
Subjects:
Lantern projection, Motion picture projection
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
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84 ARC LAMPS WITH SMALL CURRENTS [Cn. Ill The rheostat needed for the small-current, arc lamp is small and inexpensive. It need not be adjustable. One has only to be certain that it will not deliver a current above five or six amperes. In purchasing a rheostat for the house circuit, tell the manufacturer the kind of current (direct or alternating) and the voltage (no or 220). If one does not know the character and voltage of his house circuit the information can be obtained at the office of the company furnishing the current. FIG. 45. WIRING AND CONNECTIONS OF THE ARC LAMP USED ON THE HOUSE LIGHTING SYSTEM. § 130. Polarity with the arc lamp. — With alternating current both wires are the same (see § 103 and 653), but with direct current one of the wires is positive and one negative, and the positive wire must be connected with the binding post for the upper carbon. The most practical ways of determining the polarity are described in Ch. I, § 80; Ch. XIII, § 702. In case the lower carbon shows the brightest crater it is positive and hence the polarity wrong. If the separable attachment plug is of the polarized form, separate the two parts thus turning off the current. Then reverse the position of the wires in the binding posts of the lamp. This will connect the positive wire with the upper carbon as it should be. A simple way, if non-polarized plugs