Thermocouple and thermometer well

Claim 1

IN COMBINATION, A PIPE CONTAINING A HIGH PRESSURE AND HIGH TEMPERATURE FLUID, A WELL EXTENDING INTO SAID PIPE, SAID WELL HAVING A PASSAGE OPEN AT ONE END AND CLOSED AT ITS OTHER END, THE OPEN END OF SAID WELL BEING WELDED TO A WALL OF SAID PIPE, A BORE FORMED IN ANOTHER WALL OF SAID PIPE OPPOSITE THE POINT AT WHICH THE OPEN END IS WELDED, THE CLOSED END OF SAID WELL SLIDINGLY EXTENDING INTO THE BORE, SAID BORE BEING OF A GREAT ENOUGH DEPTH SUCH THAT THE CLOSED END OF SAID WELL IS FREE TO MOVE UP AND DOWM IN THE BORE DUE TO THERMAL EXPANSION CAUSED BY THE HIGH TEMPERATURE FLUIDS WITHIN SAID BORE, THE WALLS OF THE BORE BEING IN SUCH CLOSE PROXIMITY TO THE CLOSED END OF SAID WELL THAT THE CLOSED END OF SAID WELL IS PREVENTED FROM MOVING LATERALLY, A TEMPERATURE SENSING INSTRUMENT HOUSED WITHIN THE WELL, SAID TEMPERATURE SENSING INSTRUMENT EXTENDING THROUGHOUT THE ENTIRE LENGTH OF THE PASSAGE IN SAID WELL.