Scientific American, Vol. 42, No. 7 (1880)
This is a weekly American science and invention periodical, Scientific American volume 42 number 7 from 1880, published in New York for a general readership of engineers, inventors and tradesmen. Its pictures are line engravings of mechanical devices with fine hatching and labelled figure numbers, showing heating systems in plan and a wheeled foot-powered motor, a design reference for technical diagrams and period mechanical drawing.
