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 #:
000170
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 FIG. 82. TWO-MIRROR HELIOSTAT WITH THE MOVABLE MIRROR ATTACHED PARALLEL TO THE CLOCK-SHAFT. This heliostat is adjustable for latitude and can be used anywhere in the northern hemisphere, and by reversing the motion, in the southern hemisphere (§ 253). C Clock-work mounted on a hinged plate. M1 Rotating mirror attached to the side of the clock-shaft. From this arrangement its plane would pass through the celestial north pole if extended. *To get this picture, the heliostat was set in the west window of Stimson Hall at 2:30 P. M., May 20, 1912, and the mirrors arranged to receive and reflect a small beam of sunlight as indicated. A black cord was extended from the small hole in the shutter to the point on the first mirror receiving the sunbeam, and from thence to the second mirror along the path of the sunbeam ; and from the second mirror to a point on the screen receiving the sunbeam. The apparatus was then photographed. To make the course of the sunbeam very sharp for this cut its course was traced on the photograph by a right line pen. The clock-shaft was also extended above and below and an arc of a circle added between the clock-shaft and the horizon to indicate the angle of elevation of the clock-shaft, corresponding with the latitude of Ithaca (42.5° North Latitude).