A technique for measurement of velocities and size of particles in flames

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.