Algernon Percy, Earl of Northumberland. Dated: 1738. Dimensions: plate: 37.5 x 23.6 cm (14 3/4 x 9 5/16 in.) sheet: 44.2 x 30.1 cm (17 3/8 x 11 7/8 in.). Medium: engraving and etching on laid paper. Museum: National Gallery of Art, Washington DC. Aut