Scientific American, Vol. 33, No. 2 (1875)
Scientific American volume 33, number 2 from 1875 is a US weekly magazine of science and mechanical invention, written for engineers, inventors and general readers. Its pages carry engraved line drawings of steam engines, pumps, machine tools and other industrial equipment, with lettered figure keys for each part. A designer could take from them the dense cross-hatched line work of 19th-century technical engraving, with its spoked flywheels, pipework and bolted iron frames.
