Scientific American, Vol. 3, No. 9 (1860)
This is a weekly American periodical of 1860 aimed at inventors, mechanics and general readers, publishing patent-related machine designs with numbered engraved figures. The pictures are black-and-white wood engravings of mechanical devices seen in three-quarter perspective, with clear cast-iron frames, gears, and drive wheels, which a designer could draw on for mechanical line drawings, diagrams, and vintage industrial imagery.
