Scientific American, Vol. 30, No. 2 (1874)
Scientific American, volume 30 number 2 from 1874, a weekly American periodical of mechanical and scientific news for inventors, engineers and general readers. Its pages carry numbered engraved diagrams of machinery, mechanisms and devices, with figure labels and lettered parts. The engravings are precise line drawings in cross-section and elevation, useful to a designer for mechanical detailing, hatching patterns and technical diagram layout.
