1. X W C Rontgen X 1893 K F Braun C R T cathode ray tube Braun tube 1897 1 CG X 10 mmHg 10 mmHg 2. 1 2 3 1897 JJ Sir Thomson 3. OFF CG X 4 10 X 1 1m 2 4. Crookes tube 2 1 IKS MK 2 2 3 4 OFF 3 5. 3 X 10 4 IKS MK 1 2cm 5 X 136 280 X 1 10 1 1869 J W Hittorf 2 1 6. esi 1736 230 CG X CG X 4 IKS MK 7. 4 4 3 4 IKS MK Cat No 136 186 196 6 1 8 03 5626 6600 2009 10 20TD D 4132