Jacob Clay
Dutch physicist (1882–1955) / From Wikipedia, the free encyclopedia
Jacob Clay (Dutch pronunciation: [ˈjaːkɔp ˈklɑi]) (January 18, 1882–December 31, 1955) was a prominent Dutch physicist who first suggested and provided evidence that cosmic rays are charged particles.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Jacob_Clay.jpg/220px-Jacob_Clay.jpg)