Practical cinematography and its applications (1913)

Record Details:

Title:
Practical cinematography and its applications
Date:
1913
Publisher:
Philadelphia, Lippincott
Volume:
Practical cinematography and its applications
Leaf #:
000140
Language:
English
Collection:
Books
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
14
Date Added:
July 19, 2022
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ABERRATIONS OF PHOTOGRAPHY 101 becomes accentuated with each succeeding ex- posure. Accordingly, the spokes in the succes- sive pictures appear to be moving at a less speed than the rim of the wheel, and forthwith the eye imagines that the spokes are travelling back- wards, although meantime the wheel rim is seen to be advancing across the screen. This remarkable effect is produced whenever the advance of the wheel is such as to cause the spokes to move less than the angle between them, no matter what the size of the angle may be. We will now suppose that the revolving speed of the wheel is accelerated so as to cause more than a quarter of a revolution to be made while the lens is eclipsed — that the spokes move forward 95 degrees between each exposure. In this case, while the first picture will show the position indicated in Fig. 3, the next exposure will show spoke i in the position shown in Fig. 6, that is, in advance of the angle of 90 degrees and in advance of the position occupied by spoke 2 —(see the dotted line) — in the first exposure. In the third picture the spoke will be shown still farther in advance of the right angle mark, and the effect will be produced of the spokes apparently gaining upon one another. When a series of pictures taken under such conditions is thrown upon the screen in rapid succession, the