Scientific American, Vol. 2, No. 2 (1860)
A weekly American science and invention periodical from 1860, printed for a general readership of mechanics, inventors and manufacturers, with patent-model engravings of machinery and hardware. The pictures are line engravings of mechanical devices with lettered parts keyed to figure numbers, including a railroad joint and spike, a lock plate and a mechanism with a hanging weight, which a designer could use as period technical diagram styling.
