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 #:
000135
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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120 MAGIC LANTERN WITH OIL AND GAS LAMPS [Cn. V which showed general form and details with anything like satisfaction to large audiences. But screens as large as four meters square (12 ft. sq.) were used with the petroleum light. When the feeble lights discussed in this chapter are compared with the powerful electric arc light giving from 1,000 to 5,000 candlepower it would seem that the results of earlier times must have been very unsatisfactory. But the older lanternists gave very successful exhibitions. They did this by observing with scrupulous care the requirements for projection with their appliances. Condenser FIG. 64. MAGIC LANTERN WITH LARGE LIGHT SOURCE. Lamp Illuminating gas lamp with Welsbach mantle. Condenser Triple-lens condenser without water-cell. S Lantern slide. Objective Projection objective with inverted image of the luminous mantle between the lenses. Screen Image The image of the lantern slide on the white screen. ยง 193. Requirements for projection with a feeble light: (A) The lantern slides must be very transparent ; and the old, hand-painted slides were very transparent. (B) The room must be very dark. There must be no stray light from the windows or from the apparatus ; the only light must be that issuing from the lantern objective and reflected from the screen . (C) The management of the lantern must be the best possible, so that all the available light may be utilized for producing the screen image. (D) The projection objective must be of large aperture so that as much as possible of the light issuing from the large source (lamp