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 #:
000481
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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466 SIZE OF SCREENS [CH. XII If the letters and numerals and other details on the slide are too small to be seen by the normal eye when held 30 cm. (12 in.) away, then they will not show clearly in the screen image with this objective at the back of the room, although they may be plainly visible to those near the screen. As the lantern is frequently not quite at the extreme back of the room, an objective of 25 cm. (10 in.) focus is more commonly used than the one of 30 cm. (12 in.). It makes the image somewhat larger, and for many people is more satisfactory. § 636. Objective to use when the lantern is not at the back of the room. — Regardless of the position of the lantern a screen image must be large enough for all in the room to see the details as stated above (§633-634). FIG. 251. SIZES OF SCREENS NECESSARY FOR DIFFERENT SCREEN DISTANCES. This shows that the same object and objective will give a screen image of a size directly proportional to the screen distance.