Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures
Date:
1914
Author:
Gage, Simon Henry, 1851-1946
Publisher:
Ithaca, N.Y. : Comstock Publishing Co.
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures
Leaf #:
000102
Language:
English
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
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CH. Ill] ARC LAMPS WITH SMALL CURRENTS these precautions are taken, it will be very simple to connect up the lamp correctly at any time. "Polarized attachment and extension plugs" are made (fig. 48A, 4pA). These can only be put together one way. They are very convenient for direct current connections; they are also equally adapted for alternating current. FIG. 49. SEPARABLE ATTACHMENT PLUGS. (Cuts loaned by II. Ilubbell, Inc.}. A Polarized, separable plug for a lamp socket. The metal prongs are in planes at right angles and hence can be inserted in only one way, thus avoiding change of polarity with direct current. B Non-polarized attachment plug. The connection can be made either way around as the prongs are in the same plane. FIG. 50. SEPARABLE EXTENSION CONNECTOR. (Cut loaned by II. Ilubbell, Inc.). This is to enable one to extend the line by joining separate cables. These extension connectors can be had with polarized or non-polarized prongs to the cap. § 131. Carbons for small currents; feeding the carbons. — For the small currents used with the house circuit, the carbons should be small. For alternating current of five to six amperes, 8 mm. carbons answer well. For three to four amperes the carbons should not be over 6 mm. in diameter.