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

Page scan 000256 from Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine

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 #:
000256
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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CH. IX] MICRO-PROJECTION WITH DIRECT CURRENT 241 falling upon them, and hence, following the law of the conservation of energy, all this absorbed light is transformed into heat. The darker the specimen the more light is absorbed, and the quicker it will be spoiled by overheating. The stage water-cell against which the specimen rests conducts this heat away, in part, and makes it possible to exhibit the specimen a longer time (see § 852). FIG. 135. MECHANICAL STAGE OF GREAT RANGE. (Cut loaned by the Spencer Lens Co.). This can be clamped to any rectangular microscope stage and as no part of the clamp extends above the stage the full range of 85 by 65 mm. is available and slides 50 x 75 mm. (2x3 inches) can be examined to the edges. This is of the greatest convenience in examining serial sections, and also in projecting them on the screen. § 368. Microscope-tube, and focusing device. — If a tube for receiving the objective is used it should be a large one, (fig. 121, 145). The small tubes used on most microscopes, and on all when using an ocular, cut down the field too greatly (fig. 137, 147). The tube should be short, that is, about 9 to 10 cm. (4 in.) long, and 4 to 5 cm. (2 in.) in diameter. There should be coarse and fine adjustments as for the ordinary microscope (fig. 121). § 369. Mounting of objectives of low power. — For the lowest powers (125 to 75 mm. equivalent focus) it is better to have no tube at all, but to have a black shield about 15 cm. (6 in.) in diam