| Subject | English | French |
| el. | thermionic cathode | cathode chaude |
| el. | thermionic cathode | cathode incandescente |
| el. | thermionic cathode | cathode thermoélectronique |
| el. | thermionic, cold cathode and photo-cathode valves and tubes | lampes, tubes et valves électroniques à cathode chaude, à cathode froide ou photocathode |