Scientific American, Vol. 20, No. 9 (1869)
Scientific American, volume 20, number 9, published in 1869, is a weekly American periodical reporting on mechanical inventions, engineering and science for an general readership of inventors and mechanics. Its engraved pages show machines in detail: a large upright steam engine in three-quarter view, a circular gauge with a pointer, a tall graduated tube beside a test apparatus, and a set of stone-dressing machines with labelled figures, giving a designer clear, mechanical line work to draw on.
