One of three Balfour-Stewart experimental mercury thermometers, scales not divided. Balfour Stewart experimental mercury thermometer
Fluctuation thermometer, experimental, Balfour-Stewart, uncalibrated, mercury in glass. Central bulb, with wide bore tube on one side, narrow on the other Experimental fluctuation thermometer
Fluctuation thermometer, Balfour-Stewart, experimental, mercury in glass, uncalibrated. Central bulb with wide bore tube on one side, narrow on the other Fluctuation thermometer
