Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Date:
1914
Author:
Gage, Simon Henry, 1851-1944
Publisher:
Ithaca, N.Y. : Comstock Publishing Company
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Leaf #:
00069
Language:
English
Subjects:
Lantern projection, Motion picture projection
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
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54 TROUBLES WITH THE MAGIC LANTERN lCn 1 B FIG. 28 (A). DIAGRAM SHOWING THE EFFECT ON THE SCREEN IMAGE WHEN THE RADIANT is TOO NEAR THE CONDENSER. In this case the conjugate focus of the condenser (/) is considerably farther off, i. e., beyond the objective, the screen image is made smaller, and the light disc on the screen is bordered with blue. With some condensers there is a dark or blue disc in the center also. (Lettering as in fig. 26). . FIG. 29 (B). DIAGRAM SHOWING THE EFFECT ON THE SCREEN IMAGE WHEN THE RADIANT is BEYOND THE PRINCIPAL Focus OF THE CONDENSER. This brings the conjugate focus of the condenser (/) nearer the condenser, and in this case just before the light reaches the objective. It narrows the screen image and the light disc is bordered with red. (Lettering as in fig. 26). the axis, but the blue spot or disc will be on the side away from which the condenser is displaced, being just the reverse of the position when the light source is off the axis (§ 83). If the condenser is too high the blue spot or disc will be on the lower part of the screen; and if the condenser is too low the blue edge will appear on the upper part of the screen; if to the right the blue disc will be at the left, etc. That is the condenser inverts the position (fig. 27). The condenser should be correctly centered once for all and firmly fixed in position so that it need never be changed. § 85. The projection objective may be off the main axis. — The effect will be the same as when the source of light is off the axis. This is due to the fact that while the condenser inverts the rays,