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 #:
000202
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 187 carbons are in contact after striking the arc, so much current flows that there is danger of blowing the fuses or burning out some connection. Be sure that the fuses and wiring are adapted to the current (fig. 3, § 691). § 291 . Illuminating the entire opaque object. — For illuminating opaque objects, Zeiss uses the principle of the search-light. That is, the twro carbons are horizontal, the positive one has its crater facing the concave mirror (fig. 95, 96). This mirror then reflects the light toward the object. Depending upon its position, it can FIG. 104. NEW MODEL CONVERTIBLE BALOPTICON IN POSITION FOR OPAQUE PROJECTION. (Cut loaned by the Bausch & Lomb Optical Co.). In the new (1913) models of projectors by the Bausch & Lomb Optical Company provision is made in each case to place the object in a horizontal position and then to illuminate it either by a mirror (fig. iO5a) or preferably by tilting the radiant and first element of the condenser (fig. 105), so that the light from the lamp is projected directly upon the object. From the object a part of the light extends out through the vertically placed projection objective to the mirror and from the mirror to the screen. The mirror gives correct images on the screen.