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 #:
000163
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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148 HELIOSTATS FOR THE MAGIC LANTERN [CH. VI FIG. 78. ONE-MIRROR HELIOSTAT OF FOUCAULT. (From his Recueil des Travaux Scientifiques). Modified by extending the clock-shaft above and below. B Clock-work. T The clock-shaft. C The upper end of the clock-shaft. N P Continuation of the clock-shaft above the mirror (M). L° The angle above the horizontal to make the clock-shaft parallel with the earth's axis. It equals the latitude of the place where the heliostat is used (see fig 85). D Divided semicircle to enable one to set the instrument according to the sun's declination. N1 N, N Cl Connections between the clock-work and the mirror. clock-shaft is raised above the level 42.5 degrees. If now one were to sight along the clock-shaft it would be found pointing directly toward the north star. As seen from the diagram, fig. 85, it will then also be parallel with the earth's axis.