Mercury nitrogen-filled total immersion themometer measuring in the range 32-213 degrees Fahrenheit 1950-1989
Mercury immersion thermometer, nitrogen-filled, in stoppered protective plastic tube, made by Gallenkamp, London, and supplied by Griffin and George Limited, London, measuring in the range -10 to 110 degrees Centigrade, 1950-1984 Mercury immersion thermometer 1979-1984