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 #:
000180
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] DO AND DO NOT WITH SUNLIGHT 165 7. One mirror is attached to the shaft and is driven by the clock-work. The other mirror is set by hand at the beginning of the experiment (§ 239, 248). 8. As the rays of sunlight are practically parallel, only one element of the condenser is needed, viz., the one next the lantern slide (fig. 74, § 256). 9. To increase the illumination use a larger mirror and condenser (§ 257). 10. To turn the light on and off, use a metal shield (§262). n. Use a heliostat designed for the hemisphere where you are to work (§249-255). 8. Do not use a condenser with two or three lenses for sunlight as for a near light source, use only one lens or an achromatic combination designed for parallel light (fig. 74). 9. One cannot increase the illumination without increasing the size of the mirror and condenser. 10. Do not use inflammable shields to block the light. Use a metal shield between the mirror and condenser. 1 1 . Do not try to use a heliostat in the southern hemisphere which was constructed for use in the northern hemisphere.