Scientific American, Vol. 42, No. 20 (1880)
Scientific American, volume 42, number 20, issued in 1880, is a weekly American periodical for a general technical readership of inventors, engineers and mechanics. Its pages mix small trade advertisements for machinery and tools with engraved diagrams of inventions. The pictures are dense black-and-white line engravings with numbered figures, labels and captions, useful to a designer for their technical linework, lettering and compact layouts.
