Optic Projection fig 41



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Description caption: "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."
Date 1914(1914)
Source Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine, by Simon Henry Gage and Henry Phelps Gage, Ph.D. Ithaca, New York, Comstock Publishing Company. 1914. page 79.
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