Practical cinematography and its applications (1913)

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ioo PRACTICAL CINEMATOGRAPHY degrees while the lens is eclipsed. The eye at first receives the impression shown in Fig. 3. As the wheel only covers 85 degrees during the eclipse, in the second picture the eye observes that movement has occurred. Spoke i is now FIG. 6.—During the eclipse of the lens the spokes move more than the angle (AB) between them, and accordingly the wheel is seen to be moving naturally. behind the point formerly occupied by spoke 2 (shown by the dotted line in Fig. 5) in the first exposure. The lens is eclipsed once more, and the spoke moves another 85 degrees. When the next picture is seen spoke i has fallen still farther behind the 90 degrees mark, and this indication of less movement than the right angle