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An inexpensive method has been developed for determining the size, velocity and direction of flight of particles in flames by photographic means. The method consists of superimposing two photographs separated by a variable time interval. A careful choice of film and the use of various filters have enabled this technique to be used in highly luminous flames. A quick method of data retrieval from the photographs and conversion into a form suitable for direct access to a computer is also outlined.
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McCreath et al. (1972) studied this question.
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