Scientific American, Vol. 25, No. 23 (December 1871)
A weekly American technical magazine issue, published by Munn & Co. in New York in December 1871 for inventors, patent seekers, machinists and manufacturers. Wood engravings show patented devices in isolation on white ground — a shaft or spindle, cranked lever arms with square sockets, a cutaway boat interior — plus a portrait of a bearded man writing at a desk, with numbered figure labels and fine hatched shading.
