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| HYGROMETER. WET & DRY BULB, MASON'S
(0661) |
| Comprising two thermometers tubes with double scale graduation, mounted on a weather-proof case with shade. Scales graduated -10 to 50 x 1?C and 20 to 120 x 2?F. One thermometer kept dry and other has bulb covered with muslin or wick, dipped into a water reservoir, which keeps it wet during long periods of non-use. Comparing the reading of wet and dry thermometer from the humidity and temperature conversion chart included, relative humidity can be worked out. |
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