Definition that contains cathode rays
- william crookes English chemist and physicist; discovered thallium; invented the radiometer and studied cathode rays (1832-1919)
- lenard German physicist who studied cathode rays (1862-1947)
- philipp lenard German physicist who studied cathode rays (1862-1947)
- sir william crookes English chemist and physicist; discovered thallium; invented the radiometer and studied cathode rays (1832-1919)
- crookes English chemist and physicist; discovered thallium; invented the radiometer and studied cathode rays (1832-1919)