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 #:
00094
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] MAGIC LANTERN WITH SMALL CURRENTS 79 FIG. 41. THE LILIPUT ARC LAMP OF LEITZ. This lamp was designed to use with the Edinger drawing apparatus and with the condenser for dark ground illumination, etc. Both carbons are moved equally by means of the rack and pinion movement. For direct current the horizontal or positive carbon is larger than the vertical or negative carbon in the proportion of 8 to 6. The condensing lens in the tube is mounted in a telescoping sleeve. When the sleeve is in, the lens is at its principal focal distance from the crater, and gives a parallel beam of light. When the sleeve is pulled out more or less the condenser gives a converging beam of light. For use with the magic lantern the tube and special condenser are removed, as shown in fig. 47. adapters for the small carbons. Such carbons require from three to six amperes of current for the best effect (fig. 41-44). (2) A Nernst lamp with one or more filaments (fig. 54-55). (3) A Mazda lamp with concentrated filament (fig. 52). The arc lamp is permanent. One has simply to renew the carbons when they are burned out. If alternating current is used, carbons 150 mm. (6 in.) long and 8 mm. (5/i<5 in.) in diameter last about three hours. If direct current is used the upper carbon is 8 mm. (5/ir, in.) and the lower carbon 6 mm. (^4 in.) in diameter. Both are 150 rrm. (6 in.) long, and they last about three hours (ยง 753a). The Nernst and Mazda lamps are fragile and must be handled carefully. They have a working life of 500 hours, more or less, then a new lamp must be obtained.