Description
- Wet & Dry Hygro Meter
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A hygrometer is an instrument used to measure the amount of water vapor in air, in soil, or in ... A psychrometer, or a wet and dry-bulb thermometer, consists of two calibrated thermometers, one that is dry and one that is kept moist with distilled ... The Description of a New Hygrometer, invented by James Ferguson, F. R. S. .