The Garden Guide

Book: Gardening Science - Soils, Manure and the Environment
Chapter: Chapter 4: Weather and Climate

The hair hygrometer of De Saussure

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1436. The hair hygrometer of De Saussure, and the whalebone hygrometer, originally invented by De Luc, are esteemed two of the most convenient now in use. In these the quantity of moisture in the air is measured by the amount of effect produced on whalebone or hair.