Scientific American, Vol. 40, No. 24 (1879)
This is a weekly American science and engineering periodical from 1879, printed in New York for a general readership of inventors, engineers and mechanics. Its pictures are wood-engraved line drawings of machines and apparatus, labelled with lettered parts and numbered figures, and a designer might take their clean, diagrammatic linework and precise technical labelling as a reference for mechanical illustration.
