The Garden Guide

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

The hygrometer

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1431. The hygrometer varies in material; but cord, fiddlestring, and most of the substances commonly used, become sensibly less and less accurate, so as at length not to undergo any visible alteration from the different states of the air, in regard to dryness or moisture. The most common of all hygrometers is that formed of the beard of the wild oat, Avena fatua.