Electrical vapor detector

Claim 1

A VAPOR DETECTOR COMPRISING A TUBULAR CERAMIC CORE WHICH HAS BEEN IMPREGNATED WITH AN ALKALI METAL SALT SOLUTION, A HEATER TIGHTLY WOUND ABOUT SAID CORE, A CONDUCTIVE MEMBER CONNECTED TO ONE END OF SAID CORE AND CONDUCTIVELY COUPLED TO A METAL CYLINDER SURROUNDING SAID CORE, MEANS COUPLED TO SAID HEATER FOR HEATING IT TO A TEMPERATURE BELOW VISIBLE RED HEAT, A SOURCE OF HIGH VOLTAGE ENERGY COUPLED BETWEEN SAID METAL CYLINDER AND SAID HEATER TO MAINTAIN THE CYLINDER AND CONDUCTIVE MEMBER AT HIGH NEGATIVE POTENTIAL RELATIVE TO THE HEATER, INDICATING MEANS COUPLED BETWEEN THE HEATER AND THE CONDUCTIVE MEMBER AND MEANS FOR INTRODUCING VAPOR INTO THE REGION BETWEEN THE CORE AND METAL CYLINDER, THE CORE BECOMING HIGHLY CONDUCTIVE IN THE PRESENCE OF HYDROGEN SO THAT CURRENT FLOWS BETWEEN THE FILAMENT AND SUPPORT MEMBER AND THE CHANGE IN CURRENT FLOW IS INDICATED ON SAID INDICATING MEANS.