Appareil de Coulomb pour le frottement
Charles-Augustin Coulomb
original 1821, upload 2004-11
The original drawing was done by Charles-Augustin Coulomb in several of his books and studies like <i>Théorie des machines simples</i> published in 1821 and available online, see for instance <a rel="nofollow" class="external autonumber" href="https://books.google.fr/books?id=zGYSAAAAIAAJ&amp;printsec=frontcover&amp;hl=fr#v=onepage&amp;q&amp;f=false">[1]</a>, Plate 1, page 369 in reproduction page numbering.