Scientific American, Vol. 5, No. 32 (1850)
Scientific American, volume 5, number 32, from 1850, was a weekly American periodical for inventors, mechanics and general readers, printed in New York and filled with engraved diagrams of machines and devices. The three pictures show mechanical drawings: a geared wheel with a crank arm, an anti-friction shears machine with a large spoked flywheel, and a tool with a rod and a pair of hinged jaws beside small hand-shaped objects. A designer could take from them the clean line-engraving of mechanical parts, with labeled letters and precise hatching that suggest technical drawing.
