The behavior of the charged drop issuing from metal capillaries was investigated.
The dripping frequency of conductive liquids increased with increasing applied D.C. volatge, while the diameter of the dripping drop gradually decreased up to from 1.5 to 2.0 times the outside diameter of the capillary and eventually burst.
It was found that there is a critical drop diameter correlating with the minimum spraying voltage.
Theoretical approximate consideration of the critical drop diameter was further examined. The experimental data were rearranged by the modified Bond number derived theoretically and showing slight dependence on it.
The charge-to-mass ratio of the dripping drop was measured for various voltage levels, so that the specific charge of the critical drop was found to be about one-half a fully charged drop, known as the Rayleigh''s limit.