Scientific American, Vol. 5, No. 39 (1850)
Scientific American, volume 5, number 39, published in New York in 1850, is a weekly periodical for American inventors, mechanics and manufacturers, reporting new patents with engraved views of machines. Its pictures are plain black-and-white line engravings with labelled parts and lettered keys, showing dough-cutting machinery, a railway car wheel brake, and a flush water closet, useful for designers studying mid-nineteenth-century mechanical drawing.
