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Horvet cryoscope thermometer (mercury-in-glass) no.L5935 by A Science Museum Group © The Board of Trustees of the Science Museum
Horvet cryoscope thermometer (mercury-in-glass) no.L5935 by A. G(allenkamp) and Co. Ltd, calibrated -2 to +1 degree centigrade by 0.01 degree centigrade, in cardboard tube