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 #:
000702
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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BRIEF HISTORICAL SUMMARY 687 Thompson, p. 953-954) . While this works well for general lighting, it is shown in the preceding pages (553-566) that alternating current is far inferior to direct current for projection purposes. At first the carbons were both horizontal (fig. 413), then they were made vertical, and later at various angles of inclination. In order to keep the crater of the positive carbon constantly in the optic axis, Mr. Albert T. Thompson of Boston manufactured and used, especially for projection purposes, an arc lamp in which the carbons are at right angles, the positive carbon being horizontal and hence constantly in line with the axis of the projection instrument. This was in 1894." From that time onward the advantage of this position has become more and more appreciated, and the superiority for projection purposes is shown graphically in the curve given in Chapter XIII (fig. 302). The following is the statement of Mr. Albert T. Thompson concerning the 90° arrangement of the carbons in an arc lamp for the magic lantern: BOSTON, Dec. 6, 1907. "Replying to your valued communication of the 2d, I will state that I first manufactured the 90° arc lamps in 1894 and a careful search of all arc lamp and stereopticon catalogs published about that period, fails to show arc lamps of the 90° construction. . "I did not patent the lamp, for at that time there was no demand for them, and of course it was difficult to look into the future and realize that in a few years thousands and thousands would be sold. "The facts to the best of my knowledge and belief were never published in any scientific journal. Yours very truly, A. T. THOMPSON."