Automatic grain moisture control

Claim 1

IN AN APPARATUS FOR AUTOMATICALLY CONTROLLING THE MOISTURE CONTENT OF GRAIN, THE COMBINATION OF A CONDUIT HAVING A STREAM OF GRAIN FLOWING THERETHROUGH, A SET OF ELECTRICALLY INSULATED CONTACTS PROVIDED IN SAID CONDUIT AND ADAPTED TO BE BRIDGED BY THE GRAIN THEREIN, RESISTANCE RESPONSIVE MEANS IN CIRCUIT WITH SAID CONTACTS AND OPERABLE TO PROVIDE A VOLTAGE WHICH VARIES WITH VARIATION IN THE RESITANCE OF THE GRAIN BRIDGING SAID CONTACTS, A WATER SUPPLY CONDUIT FOR SUPPLYING WATER TO SAID STREAM OF GRAIN AT A POINT SPACED DOWNSTRAM FROM SAID SET OF ELECTRICALLY INSULATED CONTACTS WITH RESPECT TO THE DIRECTION OF FLOW OF SAID STREAM OF GRAIN, A PNEUMATICALLY ACTUATED PROPORTIONAL VALVE POSITIONED IN SAID WATER SUPPLY CONDUIT FOR REGULATING FLOW OF WATER TO THE GRAIN, AND MEANS FOR REGULATING PNEUMATIC PRESSURE SUPPLIED TO SAID VALVE, SAID LAST MENTIONED MEANS BEING RESPONSIVE TO THE VOLTAGE PROVIDED BY SAID RESISTANCE RESPONSIVE MEANS.