A New Technique to Photograph Small Particles in Motion

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Abstract
A new method to photograph small particles in motion is presented and shown to be feasible. The method combines the advantages of the two methods presently in use. It provides several consecutive photographs of a particle on a single negative, so that particle trajectories are easily obtained and analyzed. Further, the method uses backlight illumination, so that the shape of the particle is recorded on each exposure. The technique requires no special equipment other than that commonly used to photograph small particles. However, the method requires better synchronization than other methods, and cannot be used for all particle sizes. In the case of liquid droplets falling in air, the method is suitable for droplets 100 μ in diameter or larger. The feasibility of the method is demonstrated by recording the trajectories of a droplet falling with and without the effects of a horizontal electric field.

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