Ludwig Schneider Meteorological Precision Minimum Thermometer

Minimum thermometers are determined for meteorological measurements with subsequent reading of minimum temperatures and have to be operated in a horizontal position. In case of sinking temperature the index marker below the wetting filling will be pulled downward and remains in this position. In advance of the next measurement the upper part of the thermometer must be tilted downward to ensure that the index marker returns to the bottom of the filling.