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 #:
000508
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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CH. XIII] CURRENT RECTIFIERS 493 especially when used with moving picture projection. When 25 cycle current is used directly (is used raw) to supply the arc, the result is very bad. The screen shows a violent flicker. The general appearance is much the same as when a pan of mercury is jarred rapidly, the surface appears covered with ripples. This effect is naturally very trying to the eyes. FlG. 262. OSCILLOGRAMS OF THE ALTERNATING CURRENT SUPPLY AND THE DIRECT CURRENT DELIVERED. (Cut loaned by the General Electric Co.; made from the original photograph}. Curve A The direct current delivered. B The direct current zero line. C The alternating current voltage curve and its corresponding zero line. The height of the curve A above its zero line B represents the instantaneous value of the direct current. Note that while there are slight fluctuations in the current, i. e., it is slightly pulsating, the current is always in the same direction and that these fluctuations amount to only about 30% of the average value. Note also that the maximum current value corresponds to a maximum positive value or to a maximum negative value of the alternating current voltage as shown in curve C given just below.