Précis élémentaire de gravure sur cuivre
A French instruction manual on copper engraving published in Paris in 1891 by E. Leroux, written by the Dubouchet authors as a concise elementary guide for students of the craft. Its pictures are plain line-engraved diagrams of tools and technique: a hand guiding a burin across a copper plate, close-up sheets of parallel hatching and cross-hatching, and a wooden block device with lettered reference points. A designer could take from them a clear model for how dense parallel lines build tone and shadow in monochrome linework.
