Abstract
THE great utility of spark photography for obtaining time records of quickly-moving objects must he apparent to all who know the experiments of Mr. C. Bell, Prof. Boys, and Lord Rayleigh. By means of spark photography the shadow of any object such as a jet of water, a flying bullet, or a broken soap film can be produced with perfect definition. The shadow of the moving object illuminated by an electric spark is thrown on to a sensitive plate in a dark room, and the plate is developed in the usual manner. The process of spark shadow photography will be fund, I believe, of great service in physiological research. With a view to try this I attached a long sensitive plate to the traversing carriage of a chronograph; the moving carriage closed and opened the primary circuit of an induction coil at prearranged equal intervals of time. In front of the moving plate a frog's heart was placed in a slit on a screen; at each break a shadow of the heart was thrown on to the plate by means of the induced spark. By this means thirty positions of the heart were registered; the pictures were all sharp and clear. I have also used the same method for photographing the movements of insects.
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SMITH, F. The Photography of an Image by Reflection. Nature 47, 10 (1892). https://doi.org/10.1038/047010b0
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DOI: https://doi.org/10.1038/047010b0
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