In 1786, Coulomb announced his law that showed that the electromagnetic force between two charged sources followed an inverse square law.
Given that gravity followed a similar law, did anyone suggest a unified description?
It's worth noting that Priestley twenty years earlier, carrying out an experiment suggested by Benjamin Franklin, and on noting the absence of electrical influence inside a hollow charged sphere said:
May we infer from the experiment that the atteaction of electricity follows the same laws as that of gravity and is therefore according to the inverse square of the distances, since it is easily demonstrated if the earth is in the shape of a shell, a body inside it would not be attracted to one side of it more than the ither side.
However, Priestley wasn't saying that electricity and gravity had a unified description.