Ivory backed mercury thermometer by John Bleuler of London, 1785-95. The reverse of the scale is engraved with the bath temperature of various spas. Not in original case. Room Thermometer by Bleuler, 1785-1795 1785-1795
Elliott differential mercury thermometer (Beckmann type), by H.J. Elliott Ltd., Pontypridd, Wales, 1948-1954. Overall length 23.5 inches with auxiliary scale zero at lower end. Elliott Differential Mercury Thermometer, 1948-1954 1948-1954
Walferdin's overflow mercury thermometer for recording maximum temperatures made by H. Geissler and Müller, Bonn, Germany, 1840-1898 Walferdin's Maximum Mercury Thermometer, 1840-1898 1840-1898