French technical drawings relating to Newcomen atmospheric engine erected at Fresnes, near Conde in northern France

The engine at Fresnes has "some claim to distinction, as it was chosen by the celebrated architect Bernard Forest de Belidor for illustration and description in his well-known work Architecture Hydraulique (1737)" [H.W. Dickinson, A short history of the steam engine, 1938], after which engravings these three drawings were probably executed. With ink sketch re same and 'Memoire pour l'intelligence de la machine a feu...', With also another ink and colour wash drawing of an unidentified atmospheric engine, slightly different from the Fresnes design.