Tome neuvième.
A nineteenth-century French technical volume, identified only as Tome neuvième, held by the Eisenbibliothek Schlatt, and presumably written for engineers and physics students. Its four plates are dark-ground line diagrams of mechanical and physical arrangements: circles with labelled centres, lettered points joined by dashed construction lines, and a conical wedge over a stepped block. A designer could take from them the clean, schematic vocabulary of 1800s scientific plates, with thin white linework on black.
