These prints from The Principles of Drawing by Gerard De Lairesse. Published by Thomas Bowles: 1752, London. 5th Edition are for sale on Ebay.
The Principles of Drawing: or, An Easy and Familiar Method whereby Youth are directed in the Practice of the useful Art. Being A COMPLEAT DRAWING BOOK: Containing a Curious Collection of Examples in all the Variety of Cases; As the several Parts of the Human Body, whole Figures, Landskips, Cattle, Building &c. curiously Engraved on Copper-Plates, after the Designs of Albert Durer, Abrah. Bloemart, Carlo Morac, Le Clerc, Hollar, and other Great Masters. To which is prefix'd, AN INTRODUCTION TO DRAWING; Containg an Account of the Instruments and Materials used in DRAWING, and the Method of managing them; also Instructions to form the Judgment of a young Beginner, and direct his Hand in Practice, with easy and proper Lessons for him at the first Entrance. ALSO, Easy and Proper Lessons for a YOUNG BEGINNER, with Instructions to form his Judgment and direct his Practice. Translated from the FRENCH of Monsieur GERARD DE LAIRESSE, and improved with Abstracts from C.A. Du Fresnoy.
French 19th century academic drawing of a pair of hands.