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 #:
00092
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. II] SUMMARY FOR ALTERNATING CURRENT LANTERNS 77 7. Focus the screen image with special care when using alternating current lest the two sources of light produce a doubling of the screen image. 8. Use opera-glasses, if necessary, for focusing sharply a distant screen image (§38). 9. Look out for shadows on the screen. Center carefully and remove all causes for shadows (§83-93). 7. Do not forget the greater need for accurate focusing with an alternating current lamp, on account of the double source of light. 8. Do not forget the advantage in using opera-glasses for focusing if the screen distance is great. 9. Do not permit any defect in the management of the lantern, suspended strings, etc., to give shadows on the screen. 10. Study the "Troubles" in § 116-118, and 62-98. 10. Do not neglect any of the causes for "Troubles."