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 #:
000541
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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526 RHEOSTATS AND OTHER BALLAST [Cn. XIII wire are then covered by a burlaps sac so that there can not be a metallic contact between the masses of metal. This upper wire and its iron are then immersed in the barrel. If now the arc lamp is fitted with carbons, and the switch closed the arc will form as usual, the salt water and the iron plates serving as a rheostat. W2 FIG. 282. SALT WATER RHEOSTAT. Wlt W? Conductors. One end of conductor Wa is connected to an iron plate P2 in the bottom of the dish. The other end is connected to the plate Pt which is suspended by a string wound around the clamp. The burlaps sack 5, prevents contact of PI and P2 with resulting short circuit should the upper plate be let down too far. It is safer still to have both plates covered, and the container must be of wood, glass or stoneware, i.e. some non-conductor. The jar contains a l/4% solution of salt. The resistance is regulated by raising or lowering the plate PT. If more current is required, lower the upper plate, if less current, raise Pz so that the two plates will be farther apart.