Abstract
A new method has been described at the Oak Ridge Y-12 Plant for calculating the contact angles of microscopic mercuery droplets within a sealed glass cell under partial vacuum. The sine of the contact angle of a small pendant droplet was found to be equal to the ratio of the diameter of the circular base (as observed by a microscope through the upper glass surface and then photographed) to the maximum diameter of the same droplet photographed separately. Because the droplets studied were typically about 0.02 cm in diameter, their shapes were very nearly spherical sections and the simple calculation of the contact angle required no correction for gravitational distortion.
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