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 #:
000208
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. VII] PROJECTION OF IMAGES OF OPAQUE OBJECTS 193 The projection objective is of the Tessar Ic series of very large aperture (114 mm., 4T3 in., in diameter and 50 cm. 19^ in. equivalent focus). The focusing is accomplished by a screw which raises or lowers the table supporting the object. This instrument enables one to demonstrate to an audience the workings of a machine like a cash register, or a quarto size page of illustrations or print. With the vertical objective and a mirror to reflect the light to the screen the image will be erect. The reflecting mirror is silvered on the front to avoid the doubling of the image. FIG. 108. MODEL 5 DELINEASCOPE FOR OPAQUE AND LANTERN-SLIDE PROJECTION. (Cut loaned by the Spencer Lens Co.), With the arc lamp and the first element of the condenser in a horizortal position the light extends directly to the right through the lantern slide or other object and the projection objective, or projection microscope, or it ir.ay be reflected upward through the vertical projection microscope (fig. 175). For opaque projection, the arc lamp and first element of the condenser are, by means of the crank, rotated within the lamp-house to the right position to direct the light upon an opaque object in a vertical or in a horizontal position as desired. If the object is in a horizontal position the light from it is reflected to a mirror and from the mirror out through the large projection objective. It will appear correct in the screen image. The vertical object will have the rights and lefts inverted. Objects or surfaces 15x23 cm. (6x9 in.) can be projected with this instrument.