This work is devoted to the calculation of collision efficiencies for uncharged cloud droplets falling in field-free space and in horizontal and vertical electric fields. Collision efficiencies are determined for droplets ranging in radius from 30 to 50 microns in collision with droplets ranging from 5 to 15 microns in radius. Calculations show that collision efficiencies may be increased as much as 2400 per cent in horizontal fields of 3600 volts per centimeter.
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