Scientific American, Vol. 20, No. 17 (April 1869)
An issue of the weekly American trade and patent journal Scientific American, published in New York in April 1869 for inventors, manufacturers and mechanics. The wood engravings show patented machines in three-quarter view — a jacketed steam pan with valves and piping, a two-wheeled hand cart, a cast-iron flywheel press, a lettered boiler section — drawn with fine hatching and keyed letters that suit cutouts, technical collage and hand-press ephemera.
