Four-page set of engraved plates from Diderot and d'Alembert's Encyclopédie, labelled Part X, Thread/Fil. It shows spinning wheels (rouet) and reels or winders (dévidoir), plus thread-throwing mills in round, square and oval forms, with numbered figures showing gearing, spindles and bobbins. The pages carry only plate titles and figure numbers, with no explanatory text.