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 #:
000442
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. XI] PRECAUTIONS FOR MOVING PICTURES 427 § 592b. Table showing Speed at which flicker just disappears. — FROM T. C. PORTER Flashes per second Illumination Logarithm of at which flicker meter candles illumination just disappears .0625 8.796-10 17.75 .in 9.046-10 18.08 .25 9.398-10 18.50 i.oo o.ooo 25.08 4.00 0.602 33.50 1.56 0.193 28.00 2.70 0.431 32.00 6.30 0.799 35-50 25.00 1-398 42.66 IOO.OO 2.OOO 5O.I6 IOO.OO 2.OOO 5O.83 178.00 2.250 55.08 400.00 2.602 56.42 1600.00 3.204 65.00 6400.00 3.806 71.00 RESULTS FOUND BY THE AUTHORS WITH A MOVING" PICTURE OUTFIT 32.00 1.500 36 IOO.OO 2.OOO 41 1000.00 3.000 50 3200.00 3.500 54 The curves (fig. 234) are drawn to show the speed at which flicker disappears for equal light and dark flashes. There is not a great advantage as far as the speed at which flicker disappears in having the duration of the dark flash very short. The actual appearance of flicker is much less violent, however, when the dark section is narrow. GENERAL PRECAUTIONS § 593. Inspection of films. — Before attempting to show films to an audience, it is well to inspect them carefully to see that they are in good condition and wound on the reel correctly. Use the rewinder to roll the film from the new reel upon an empty reel. Turn the handle slowly with one hand while holding the edge of the film between the fingers of the other hand; do not touch the face of the film. When a patch is met in the film inspect it carefully to see that: (i) The same side of the film is on top. (2) The patch is made at the right place so there will not be a misframe,