Scientific American, Vol. 22, No. 2 (1870)
Scientific American volume 22, number 2, from 1870, a weekly American periodical for engineers, inventors and general readers, printed in New York. Its pages carry wood-engraved drawings of machinery and devices with explanatory text. The engravings show steam engines with flywheels and valve gear, sectioned cylinders with lettered parts, and a multi-chamber vessel on pipe legs, all in dense black line with hatched shading that a designer could borrow for technical diagram styling.
