Scientific American, Vol. 21, No. 22 (1869)
A weekly American science and mechanics periodical from 1869, aimed at inventors, engineers and general technical readers, its pages carrying wood-engraved diagrams of patented devices. The four pictures show a folding awning mechanism with a wound roller, a lapidary's jig for dressing millstones with a diamond tool, a two-part lamp and oil vessel in exploded section, and a tapered can with a spout; a designer could draw on their crisp hatched line work and clear exploded-view labelling.
