Scientific American, Vol. 21, No. 5 (1869)
Scientific American volume 21, number 5, issued in 1869, is a weekly American periodical of mechanical and scientific news for inventors, engineers and general readers. The pictures are plain line engravings of patented devices, including a ball-and-socket fitting, a cup on a stand, a leather harness-like piece and a lateral-motion railway truck, drawn with lettered reference points and cross-hatched shading that a designer could borrow for technical diagrams.
