Abstract
A RECENT number of La Nature (April 30) contains a very interesting account of the latest work of the Marey Institute. By means of the new instrument, the ultra-rapid kinematograph invented by M. Bull, sharp stereoscopic kinematograph views may be obtained of such extremely rapid movements as, for instance, the flight of a fly or the breaking of a soap bubble. With the ordinary kinematograph the photographic film moves discontinuously, being arrested at the moment of each exposure. While this is simple enough at moderate speeds, it would be quite impossible where the exposures are at the rate of 2000 a second, and the mean speed of the film 4000 cm. a second. These are the figures that are necessary for the study of insect flight, and these are attained in the new instrument. With such a speed the movement of the film must be continuous, and a sharp image is possible only if the exposure does not exceed 1/400,000 second, and for this the electric spark gives a light of sufficiently short duration.
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BOYS, C. The Ultra-Rapid Kinematograph . Nature 84, 112–113 (1910). https://doi.org/10.1038/084112a0
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DOI: https://doi.org/10.1038/084112a0