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 #:
000214
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. VII] DO AND DO NOT IN OPAQUE PROJECTION 199 9. Use two radiants or mirrors for avoiding shadows with solid objects (§ 292). 10. Select objects which reflect well for opaque projection (§ 285). 11. If very light-absorbing objects must be projected, use a white background (§ 285). 1 2 . Use a hand-feed arc lamp for opaque projection (§ 289, 290). 13. Make sure that the wiring is adapted to the heavy currents needed for opaque projection (§ 290). 14. Use carbons of the proper size for the current drawn (§ 290, 7S3a). 1 5 . Make the images erect by placing the object up-side down for the vertical position, or with the upper edge away from the screen for the horizontally placed objects (§ 293-294). 1 6. Use a mirror or prism to avoid a mirror image on a vertical, opaque screen (§ 293295) 9. Do not light solid objects so that there will be deep shadows. Use two radiants, or mirrors, or arrange so that the light strikes the object directly, not obliquely. 10. Do not select badly reflecting objects for opaque projection. 1 1 . Do not use a black background on which to place dark objects. 12. Do not use an automatic right-angle carbon arc lamp for the heavy currents needed for opaque projection. 13. Do not nm any risks by using the heavy currents on wiring not adapted to it. 14. Do not use small carbons for big currents. 15. Do not get the images wrong side up on the screen. 1 6. And do not expect too much in opaque projection. Know the principles involved; study fig. 90-91.