Scientific American, Vol. 34, No. 7 (1876)
Scientific American, volume 34, number 7, a weekly American science and engineering periodical from 1876, printed for inventors, mechanics and general technical readers. Its pictures are black-and-white wood engravings of apparatus: a telephone-era electrical sketch labelled with lettered parts, a large textile loom with rows of rollers, a lathe-like machine drawn in plan and elevation, and a warping mill with reels and gears. A designer could take the crisp line drawings, lettered callouts and dense mechanical detail as a model for technical diagrams.
