Temperature indicating apparatus

Claim 1

IN AN AUTOMOBILE RADIATOR CAP FITTED WITH A YIELDABLE SEALING MECHANISM, THE IMPROVEMENT IN COMBINATION THEREWITH COMPRISING A CONDUIT T WITH ITS ARMS PERPENDICULARLY ORIENTED RELATIVE TO SAID CAP, THE LOWER ARM SEALINGLY ATTACHED TO A CENTRAL PASSAGEWAY THROUGH THE CAP AND ASSOCIATED SEALING MECHANISM, A THERMOMETER WITH ITS STEM RELEASABLY POSITIONED FOR LONGITUDINAL SLIDING MOVEMENT THROUGH NTHE ARMS OF THE T AND OF SUBSTANTIALLY GREATER LENGTH THAN THE COMBINED LENGTHS OF THE T ARMS AND CENTRAL PASSAGEWAY, THE DIAMETER OF THE STEM OF THE THERMOMETER BEING SUFFICIENTLY SMALLER THAN THE INTERIOR DIAMETER OF THE T ARMS TO PROVIDE AN ANNULUS FOR PASSAGE OF GAS BETWEEN THE STEM AND THE INNER WALL OF THE T, A CLOSE FITTING RESILIENT O-RING AND ASSOCIATED COLLAR NUT ENCIRCLING THE UPPER STEM OF THE THERMOMETER, SAID COLLAR NUT BEING THREADEDLY CONNECTED TO THE END OF THE UPPER ARM OF THE T AND ADAPTED TO PRESS THE O-RING AGAINST THE UPPER MOUTH OF THE ANNULUS AND AGAINST THE STEM OF THE THERMOMETER, WHEN THE COLLAR UNIT IS TIGHTENED, TO SEAL THE ANNULUS AND HOLDS THE THERMOMETER STEM MOTIONLESS, AND A PRESSURE GAUGE CONNECTED TO THE FOOT OF THE CONDUIT T AND COMMUNICATING WITH SAID ANNULUS.