First lessons in metal-working
A late nineteenth-century instruction manual by Alfred G. Compton, published in New York in 1890 by J. Wiley & Sons, teaching beginners the basics of metalworking. The pictures are plain line diagrams of tools and work, numbered as figures, showing a hammer striking a chisel or cold chisel on a block, a bent strip of metal, and a dimensioned sheet with holes. A designer could take from them the clear, schematic way of showing a tool at work against a hatched block.
