Scientific American, Vol. 14, No. 8 (1866)
Scientific American, volume 14, number 8, is a weekly American periodical from 1866 that reported on inventions and mechanical technology for a general readership of engineers, mechanics and inventors. Its pages show mechanical drawings with numbered figures: a sectioned valve body with a stem and bushings, a pair of calipers with a graduated arc and clamp, and a governor with suspended balls on a vertical spindle, all in fine hatched line engraving a designer could borrow for diagrammatic, industrial or machine-age motifs.
