Signedmarked: Dr. Bender & Dr. Hobein, München
Inscribedon thermometer: Centigrade Normalthermometer
FunctionThis is a thermometer that the user can fill with different amounts of mercury to use at different temperature ranges. It is very precise but because of this it has a narrow range of 5.6 degrees Celsius. To set it up for use, the thermometer would be placed in contact with a substance a few degrees above the upper required limit of temperature, and enough mercury would then be poured in so that the stem filled up to the s-bend. That way, the thermometer would have a range up to that temperature.
ProvenanceFrom the Department of Physics, Lyman Laboratory, Harvard University.