Scientific American, Vol. 30, No. 23 (1874)
Scientific American, volume 30, number 23, is a weekly American periodical of 1874 that reported on inventions and mechanical technology for an engineering and general readership. The pictures are line-engraved patent-style diagrams of a file-like tool, a faucet valve section, a hand-held engraving pen with a wooden surface, and a sectional tank with a balance scale, each labelled with letters for reference. A designer could draw on their clean hatching and cross-section conventions for technical line work.
