Then the electrons to the island each drop of oil droplets that come with electrons is not equal, that some drops of oil droplets adhering to a single electron. Some have more than one drop of the oil droplets to fall by force of gravity. Then an electric current into the positive and negative plates. Anion pads on the bottom to push oil droplets with electrons come to a standstill. Which is viewed with a microscope (microscope) shows that the force of gravity equals the force of an electric field. Then calculate the charge