21 magg 1897 anni - Sir J.J Thomson
Descrizione:
In 1897, J.J. Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged. In addition, he also studied positively charged particles in neon gas.Aggiunto al nastro di tempo:
Data:
21 magg 1897 anni
Adesso
~ 128 years ago