Hygrometer Small 320×148 Medium 640×297 Large 1024×474 Download Tiff Original 2400×1112 | (326.4 KB) Description An instrument developed by Edison used to measure humidity. Keywords Edison, humidity, hygrometer Galleries Meteorology Source: J. G. Holland Scribner's Monthly, An Illustrated Magazine For The People (New York: Scribner & Co., 1879) 453 Courtesy the private collection of Roy Winkelman
