A physionotrace of a man, engraved by Bauchardy at the Palace Royal, Paris, France, in about 1808. Gilles Louis Chretien (1754-1811) invented the Physionotrace, a machine designed to produce an engraved copper plate from which multiple copies of a profile could be printed. The artist drew the profile using a pointer attached by a system of levers to an engraving tool. This engraving tool then traced the image onto copper plate prior to printing.
© Kodak Collection / National Science & Media Museum / Science & Society Picture Library