Scientific American, Vol. 22, No. 12 (March 1870)
A weekly issue of Scientific American, published by Munn & Co. in New York in March 1870 for inventors, engineers, and manufacturers following new patents. The pictures are small wood-engraved figures of machine parts — turbine runners, bolted housings, sectional views with ruled hatching, and letter-keyed diagrams — usable as line-art mechanical motifs, cutaway textures, and numbered figure labels.
