An apparatus is described for measuring the mass, velocity of fall, sign, and free electric charge of individual falling raindrops. Two vertically separated rings are so arranged that naturally charged raindrops fall through them and induce pulses on the grid of a vacuum tube amplifier which in turn operates a tape oscillograph. From the characteristic double pulses produced, the charges and transit times may be determined. The mass of the droplet is simultaneously determined by measuring the size of the spot produced when the drop falls on blueprint paper tape traversing the oscillograph. Short cuts for the reduction of data on drop sizes are given.
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Ross Gunn (1949) studied this question.
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