A New Method for High-Speed Motion-Picture Photography of Transparent Drops

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Abstract
A new method applicable to high-speed motion-picture photography of moving transparent drops is described. Previous methods have not considered the optical properties of drops as image-forming, spherical convex lenses. By taking advantage of this property of transparent drops, it has been possible to produce sufficient light contrast between the drop and its illuminated background to enable drops to be photographed. It is concluded that high-speed motion-picture photography of transparent drops can be accomplished where it is possible to produce sufficient light contrast between the drop and its background to make the drop visible. Two highly satisfactory methods of producing this contrast were tested experimentally and found to produce an excellent technique that could be used for a variety of investigations in the aerosol field.

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