Abstract
When a stream of particles is conveyed by air or water in a glass pipe two photographs of a portion of the stream are superimposed on the same photographic negative. The pictures are taken by the light from a pair of discharge lamps, the time interval between the flashes being variable and measured by a rotating disk. A more satisfactory light source is a high speed stroboscope, the interval between flashes being predetermined by a setting of a multivibrator. The velocity of a particle is obtained from its displacement measured on the photograph. The method is illustrated by its application to the movement of gravel by air and coal by water.
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