Essai de perspective
Essai de perspective is a 1711 treatise on perspective and the camera obscura by Willem Jacob 's Gravesande, published at The Hague by the widow of Abraham Troyel for readers of French. The picture is a title-page vignette of a closed book flanked by crown, feathers, roses, lilies and a bundle of leaves, engraved in fine black line on aged paper. A designer could draw on its symmetrical floral cartouche arrangement and crisp engraved line for ornamental frames, emblems or heraldic-style badges.
