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Free-fall patterns of unrimed spatial crystals and of aggregates containing spatial crystals and dendrites were recorded by stereo-photography. Terminal fall velocities were determined for crystals between 0.02 and 0.9 cm in diameter. Horizontal velocities were found to he small in comparison with the vertical velocities. Some rotatory motions were also observed but are not well documented.
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J. Zikmunda (1972) studied this question.
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