Scientific American, Vol. 33, No. 23 (1875)
Scientific American, volume 33, number 23 from 1875, a weekly American periodical of technical news and invention for engineers, mechanics and general readers. The pictures are black-and-white line engravings of machines and devices, labelled with letters keyed to explanatory text. A designer might take from them the crisp hatched linework and the diagrammatic, part-by-part way mechanisms were drawn for technical clarity.
