Scientific American, Vol. 20, No. 10 (March 1869)
A weekly issue of Scientific American from March 1869, published in New York for inventors, manufacturers, and mechanics, reporting new patents and machinery. Wood engravings show velocipedes, four-wheeled carriages, and cast-iron blowers in side elevation, with fine hatching for shadow and clean outlines useful for spoked wheels, linkages, and machine-part silhouettes.
