Scientific American, Vol. 19, No. 1 (1868)
Scientific American volume 19 from 1868 is a weekly American periodical for inventors, engineers and mechanics, printed in New York. Its pages carry wood-engraved drawings of patented machines, tools and devices, such as a flywheel with speed-regulating gearing, an oval compass for drafting, a water turbine with curved vanes, and a ship's steering apparatus with a wheel and geared quadrant. The engravings are crisp, with dense parallel hatching and clear outlines, giving a designer precise mechanical forms and shading to borrow for technical diagrams.
