Scientific American, Vol. 34, No. 20 (May 1876)
A weekly issue of Scientific American from May 1876, published in New York by Munn & Co. for inventors, mechanics, and patent-minded readers. Wood engravings show patented machinery in isolation on white: spoked-wheel implements, sectional diagrams of boilers and pumps, rolling mills on splayed cast legs, all drawn in fine hatched line with heavy blacks and numbered figure labels.
