Les manuscrits de Léonard de Vinci \
A facsimile edition of Leonardo da Vinci's notebooks, transcribed and edited by Charles Ravaisson-Mollien and published in Paris by A. Quantin in 1881 for scholars and collectors of manuscripts. The pictures are pen-and-ink sketches on aged paper showing machines, hoists, gears and mechanical devices, with mirror-written notes in the margins; a designer might take from them the quick, schematic draughtsmanship of early mechanical diagrams and their annotated layout.
