Joseph Priestley (Unification of Physics - dream of any Physicist)

Joseph Priestley (1733-1804), English chemist and physicist, was notable for the discovery of many gases, including oxygen, an orphan, had a poor childhood, becoming unionist minister (preached the unity of all Christian churches), the radical ideas both in religion as in politics.

Very intelligent, wrote on various subjects, religious, scientific and political, and knew at least nine languages. He was an amateur, experimental scientist and his interest in electricity emerged from a meeting with Franklin, in London, in 1766.

Franklin asked Priestley to redo an experience that left him very puzzled: an electrostatic pendulum was attracted to a closed container loaded when approached from the outside, but placed inside the container, nothing happened.
Priestley not only confirmed the observation of Franklin as he remembered that, theoretically, this phenomenon also occurred with gravitational forces.

According to the Newtonian gravitational theory, if a body to be placed inside a hollow planet not suffers any gravitational attraction. Priestley concluded with remarkable perception, that the interaction between electric charges due to their bodies should be similar to the interaction due to their masses.

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