Apparatus for testing a material's reaction to illumination and humidity with capacitor-type humidity detector

Claim 1

IN AN APPARATUS FOR TESTING THE REACTION OF MATERIAL SPECIMENS TO IRRADIATION AND HUMIDITY, IN COMBINATION, A STATIONARY SOURCE OF IRRADIATION; MOVABLE CARRIER MEANS FOR MOVING AT LEAST ONE MATERAL SPECIMEN ACROSS THE FLUX OF RADIATION EMANATING FROM SAID SOURCE AND INCLUDING AT LEAST ONE SPECIMEN HOLDER MEANS ADAPTED TO HOLD SAID MATERIAL SPECIMEN IN AT LEAST ONE PREDETERMINED POSITION WITH ONE SIDE THEREOF FACING SAID SOURCE SO AS TO CAUSE IRRADITAION THEREOF WHILE IT IS MOVED, SAID SPECIMEN HOLDER MEANS INCLUDING HYGROMETER MEANS INCLUDING TWO CAPACITOR PLATE MEMBERS ARRANGED ON OPPOSITE SIDES OF SAID SPECIMENT WITH ONE OF SAID CAPACITOR PLATE MEMBERS LOCATED IN FRONT OF SAID ONE SIDE OF SAID SPECIMEN AND BEING IRRADIATION PERMEABLE SO AS TO LET SAID IRRADIATION PASS THERETHROUGH TO IMPINGE ON SAID SPECIMEN, SAID MATERIAL SPECIMENT PLACED AS A DIELECTRIC BETWEEN SAID PLATE MEMBERS CONSITUTING A CAPACITANCE OF VARIABLE MAGNITUDE DEPENDING ON THE HUMIDITY OF SAID