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 #:
000213
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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DO AND DO NOT IN OPAQUE PROJECTION tCn. VII § 297. Summary of Chapter VII: Do 1. Select an objective of large aperture for opaque projection (§ 275) 2. Use a light of great brilliance like sunlight or the arc light (§ 274, 277). 3. Make the screen image only six to ten times as large as the object (§ 287). 4. Make the projection room very dark (§ 280). 5 . Use a very white screen or under some conditions a metallic screen (§ 286, 621). 6. From 25 to 50 amperes of direct current are needed to give good opaque projection (§ 289). 7. If lantern slides and opaque objects are projected at the same exhibition, use a neutral tint (smoky) glass to make the lantern-slide image as dim as the image of the opaque object (§ 282). 8. Use a condenser for opaque objects somewhat larger than the object (see fig. 114). Do NOT 1. Do not undertake opaque projection with an objective of small aperture. 2. Do not expect good opaque projection unless from 20 to 50 amperes of direct current, or greater amperages of alternating current are available. 3. Do not try to magnify the object too much. 4. Do not try to project in a light room. It must be dark. 5. Do not be satisfied with a dirty, non-reflecting screen. It must be white. 6. Do not expect brilliant screen images with a weak light. 7. Do not pass quickly from the dim pictures of opaque objects to the brilliant pictures of transparencies. Dim the transparencies down to the opaque images. 8. Do not use a small condenser for a large object.