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 #:
000198
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 183 the right-angled arc goes out easily from the magnetic blow when the current is above 25 to 30 amperes. Of course, in opaque projection, where the most powerful light available is demanded, alternating current is far less satisfactory than direct current ; still with skillful application of the light available even alternating FIG. 99. THE INDEPENDENCE POST-CARD PROJECTOR. (Cut loaned by Williams Brown & Earle). This is in principle exactly like Chadburn's opaque lantern with two lamps (fig 93) In this projector the lamps are usually of the incandescent form, and connection is made with the house-electric lighting system. current radiants give fairly good opaque projection (see Ch. XIII, ยง 7 53 a for size of carbons with different currents, etc.). For favorable objects and good conditions one must use not less than 20 to 25 amperes of direct current for successful screen pictures of opaque objects. Those with most experience in the work use 40 to 50 amperes. For alternating current satisfactory results can hardly be obtained with less than 40 amperes, and 60 to 80 are better.