Sir Frederick William Herschel; Edward Scriven; 1775-1841; British; after John Russell; 1745-1806; British; ca.1830; Engraving on medium; slightly textured; cream; wove paper; mounted on; moderately thick; slightly textured; cream; wove paper; Mount: 23 15/16 x 17 1/8 inches (60.8 x 43.5 cm); Image: 5 1/8 x 4 1/16 inches (13 x 10.3 cm); and Sheet: 9 7/8 x 7 3/16 inches (25.1 x 18.3 cm)