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 #:
000172
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. VI] HELIOSTATS FOR THE MAGIC LANTERN 157 FIG. 83. LENS AND PRISM HELIOSTAT OF ALFRED M. MAYER. (From the American Journal of Science, Vol. 154, iSg1^). This heliostat is in principle like the two-mirror heliostat with the movable mirror attached to the end of the clock-shaft (fig. 81). J Biconvex lens about 10 cm. (4 in.) in diameter to receive the sun's rays and render them convergent. K Concave lens to render the converging beam parallel. g Rack and pinion movement to change the position of the concave lens and thus increase or diminish the size of the beam. / Right-angled prism receiving the parallel bundle from K and reflecting it to a fixed prism (L) or to a mirror, by which it is reflected in any desired direction. The two lenses J K and the prism /, are all on one common axis and are rotated by the clock-shaft G, and thus made to follow the sun like the mirror on the end of the clock-shaft in figure 81. The clock-shaft G must be at an elevation corresponding to the latitude of the place (see also fig. 84).