Grain drying control gauge

Claim 1

IN GRAIN DRYING APPARATUS INCLUDING A GRAIN BIN, A CONDUIT LEADING INTO SAID GRAIN BIN, MEANS FOR FORCING AIR UNDER PRESSURE INTO SAID GRAIN BIN THROUGH SAID CONDUIT, AND MEANS FOR MAINTAINING THE RELATIVE HUMIDITY OF THE AIR MOVING THROUGH SAID CONDUIT BELOW A GIVEN LEVEL; THE IMPROVEMENT WHICH COMPRISES A MANOMETER, A PRESSURE SENSING DEVICE OPERATIVELY CONNECTED TO SAID MONOMETER AND RECEIVED IN SAID CONDUIT AND HAVING AN OPENING THEREIN TRANSVERSE TO THE DIRECTION OF SAID CONDUIT FOR MEASURING THE PRESSURE IN SAID CONDUIT, AN ELEMENT FIXEDLY MOUNTED ADJACENT SAID MONOMETER, FIRST CALIBRATIONS ON SAID ELEMENT IMMEDIATELY ADJACENT SAID MANOMETER AND CONVERTING THE READINT THEREOF INTO VOLUME RATE OF FLOW OF AIR THROUGH SAID CONDUIT, AN INDICATOR DISC ROTATABLY MOUNTED WITH REALTION TO SAID ELEMENT, FURTHER CALIBRATIONS ON SAID ELEMENT ADJACENT SAID INDICATOR DISC AND SETTING FORTH DRYING TIME REQUIRED, SAID INDICATOR DISC HAVING A WET VOLUME SCALE AND A POINTER THEREON AND FIXED WITH RELATION THERETO, SAID POINTER INDICATING DRYING TIME FROM SAID FURTHER CALIBRATIONS WHEN SAID WET VOLUME SCALE IS POSITIONED WITH THE ACTUAL WET VOLUME AT THE SENSED VOLUME RATE OF FLOW OF AIR.