Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 445
od of darkness that the film is jerked forward to get the nextpicture into position for projection. The eye, however, detects no jieriod of dark-ness, for on account of persistence of vision it continues to see the stationarypicture not only during this period of darkness but dimly for an instant… … Photographs of Sound Waves having their Origin in an ElectricSpark behind the Middle of the Black Disk 1. A spherical sound wave. 2. The same wave .00007 second later. 3. A wave re-flected from a plane surface, curvature unchanged. 4. A wave reflected from aconvex surface, curvature increased. 5.…
Physics
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