Apparatus for determining the cooling power of quenching baths

Claim 1

IN AN APPARATUS FOR DETERMINING THE COOLING POWER OF A QUENCHING BATH, A BODY SURROUNDING AND TOUCHING A THERMOELECTRIC COUPLE AND ADAPTED TO BE HEATED TO A PREDETERMINED TEMPERATURE IMMERSED IN A QUENCHING BATH, A DIRECT CURRENT ELECTRONIC AMPLIFIER CONNECTED OT THE OUTPUT OF THE THERMOELECTRIC COUPLE AND AMPLIFYING SAID OUTPUT, A FIRST CIRCUIT CONTROLLED BY THE OUTPUT FROM SAID DIRECT CURRENT ELECTRONIC AMPLIFIER COMPRISING A POWER STAGE, A CHART BEARING MOVABLE FRAME, MEANS FOR DISPLACING SAID MOVABLE FRAME ALONG A LINE, SAID MEANS BEING DRIVEN BY THE OUTPUT OF THE PREVIOUSLY MENTIONED POWER STAGE, A SECOND CIRCUIT CONNECTED TO THE OUTPUT FROM SAID DIRECT CURRENT ELECTRONIC AMPLIFIER AND COMPRISING A DIFFERENTIATING STAGE FOLLOWED BY A POWER STAGE, A MOVABLE MEMBER DRIVEN TRANSVERSELY TO THE DIRECTION OF MOVEMENT OF THE FRAME BY THE OUTPUT FROM SAID LAST MENTIONED POWER STAGE, SCRIBER MEANS CARRIED BY THE MEMBER FOR PLOTTING ON THE PREVIOUSLY MENTIONED MOVABLE FRAME THE POSITION OF SAID LAST MENTIONED MOVABLE MEMBER, THE RESULTING CURVE CORRESPONDING IN THE "COOLING SPEED/TEMPERATURE" CURVE OF THE QUENCHING BATH.