The Garden Guide

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

A copper funnel rain-gauge

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1440. A. copper funnel forms another very simple rain-gauge: the area of the opening must be exactly ten square inches. Let this funnel be fixed in a bottle, and the quantity of rain caught is ascertained by multiplying the weight, in ounces, by 173, which gives the depth in inches and parts of an inch.