Humidity sensing apparatus

Claim 1

APPARATUS OF THE CLASS DESCRIBED COMPRISING, IN COMBINATION: A FIRST MEMBER HAVING A RADIATION EMITTING SURFACE EXPOSED TO THE GAS THE HUMIDITY OF WHICH IS TO BE MEASURES; PELTIER COOLING APPARATUS HAVING AN INPUT AND HAVING A COLD JUNCTION CONNECTED TO THE FIRST MEMBER SO AS TO COOL THE SURFACE OF SAID FIRST MEMBER TO SUBSTANTIALLY THE DEW-POINT TEMPERATURE, THE MOISTURE WHICH FORMS ON THE SURFACE OF SAID FIRST MEMBER AT THE DEW-POINT TEMPERATURE OPERATING TO ABSORB A PORITION OF THE RADIATION EMITTED THEREFROM; FIRST RADIATION DETECTING MEANS RECEIVING THE RADIATION FROM THE SURFACE OF SAID FIRST MEMBER AND PROVIDING A PULSED OUTPUT OF A FIRST SENSE INDICATIVE OF THE AMOUNT OF RADIATION RECEIVED; A SECOND MEMBER HAVING A RADIATION EMITTING SURFACE; SECOND RADIATION DETECTING MEANS RECEIVING THE RADIATION FROM THE SURFACE OF SAID SECOND MEMBER AND PROVIDING A PULSED OUTPUT OF A SECOND SENSE OPPOSITE THE FIRST SENSE INDICATIVE OF THE AMOUNT OF RADIATION RECEIVED; MEANS MOUNTING SAID SECOND MEMBER FOR MOVEMENT RELATIVE TO SAID SECOND RADIATION DETECTING MEANS TO ESTABLISH A PREDETERMINED OUTPUT FROM SAID SECOND RADIATION DETECTING MEANS; FIRST INTEGRATING MEANS CONNECTED TO RECEIVE THE OUTPUT OF SAID FIRST RADIATION DETECTING MEANS AND PRODUCE A SIGNAL OUTPUT OF THE FIRST SENSE AND OF MAGNITUDE INDICATIVE OF THE AVERAGE AMOUNT OF RADIATION RECEIVED BY SAID FIRST RADIATION DETECTING MEANS; SECOND INTEGRATING MEANS CONNECTED TO RECEIVE THE OUTPUT OF SAID SECOND RADIATION DETECTING MEANS AND PRODUCE A SIGNAL OUTPUT OF THE SECOND SENSE AND OF MAGNITUDE INDICATIVE OF THE AVERAGE AMOUNT OF RADIATION RECEIVED BY SAID SECOND RADIATION DETECTING MEANS;