KEMPELEN, [WOLFGANG VON]. Le Mécanisme de la Parole, suivi de la Description d'une Machine Parlante et enrichie de XXVII planches. Vienna, 1791. Engraved portrait frontispiece and 26 engraved plates. 8vo, conteporary wrappers, edges uncut, front cover partially detached, spine splitting and chipping, some wear to edges.