Scientific American, Vol. 24, No. 13 (1871)
Scientific American, volume 24 number 13 from 1871, a weekly American periodical of mechanical and technical news printed in New York for inventors, engineers and general readers. Its pictures are precise black-and-white line engravings of patented devices, including a joint stock tool, a wheel with spokes, a stair newel post and envelope folds, drawn with labelled figure numbers and clean outlines that suggest plain technical diagram layouts for a designer.
