Protectively contained sensing apparatus

Claim 1

A TEMPERATURE-MEASURING DEVICE FOR A SALT BATH, AND THE LIKE, COMPRISING: (A) AN OUTER TUBULAR ELEMENT HAVING GENERALLY AN L SHAPE AND DEFINED BY (1) A HOT LEG PORTION ADAPTED TO BE GENERALLY VERTICALLY DISPOSED, AND (2) A COLD LEG PORTION ADAPTED TO BE GENERALLY HORIZONTALLY DISPOSED, THEREBY DEFINING SUBSTANTIALLY A RIGHT ANGLE, WITH SAID LEG PORTIONS BEING UNITED BY A GENERALLY ELLIPTICALLY-SHAPED WELD, (B) AN INNER TUBULAR ELEMENT CONCENTRICALLY DISPOSED WITHIN SAID HOT LEG PORTION TO PROVIDE AN ANNULAR SPACE THEREBETWEEN, (C) MEANS CLOSING THE LOWER END OF SAID HOT LEG PORTION AND THE LOWER END OF SAID INNER TUBULAR ELEMENT, (D) A CENTRALLY APERTURED ELLIPTICAL-SHAPED PLATE EXTENDING BETWEEN THE UPPER END OF SAID INNER TUBULAR ELEMENT AND THE WELD JUNCTION BETWEEN SAID HOT AND COLD LEG PORTIONS AND WELDABLY SECURED THEREBETWEEN, SAID PLATE, WITH SAID CLOSING MEANS, DEFINING A SEALED CHAMBER BETWEEN SAID INNER TUBULAR ELEMENT AND SAID HOT LEG PORTION, (E) A PRESSURE FLUID IN SAID CHAMBER, AND (F) GENERALLY L-SHAPED THERMOCOUPLE MEANS IN SAID INNER TUBULAR ELEMENT EXTENDING PAST SAID JUNCTION AND WITHIN SAID COLD LEG, SAID THERMOCOUPLE MEANS BEING EQUIPPED WITH COLD END CONNECTION MEANS ADJACENT THE END OF SAID COLD LEG PORTION OPPOSITE THE END THEREOF WELDED TO SAID HOT LEG PORTION.