Minimum-maximum thermometer designed to float for use in water evaporation measurements. It is used together with a device to measure the level of the water (not seen). The thermometer tracks changes in water temperature that change air pressure in a bulb reservoir and moves a column of liquid. The tube is U-shaped,allowing a scale to be added to both sides and the two levels of the liquid used to track minimum and maximum temperature levels. The U-shaped tube is at centre and the bulbs are under a sunlight shield at upper centre. Markers inside the U-tube,moved in only one direction by the column of liquid,mark the minimum and maximum water temperatures | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Rapson, Paul |
Bildgröße: | 4613 px × 4320 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |