P 802 Published 31/03/2020 at 2560 × 926 in Object of the Month: March 2020 ← Previous Next → Mercury thermometer from G. M. L. Leyser’s factory in Leipzig, around 1870, in wooden case, length 20,5, diameter 1,2 cm. Originally used by Josef Salmon (1844-1931), a Prague paediatrist. NML Medical Museum, P 802.