pentane thermometer
Date: 1890-1915
Inventory Number: 4427
Classification: Thermometer
Dimensions:0.9 x 37.4 cm (3/8 x 14 3/4 in.)
case: 42.3 x 2.3 cm (16 5/8 x 7/8 in.)
Accessories: black cardboard case with pink inner surface, metal cylindrical case outside
Description:
A thermometer consisting of a thin glass tube filled with a clear liquid (pentane) resting inside an outer glass tube that also contains a milk glass scale for the thermometer, calibrated from -200°C to 50°C with a 1 degree precision. It has a cylindrical bulb filled with a clear liquid (and an air bubble) at one end, while at the other end it has a small glass sphere.