The Channel Sketchbook; Joseph Mallord William Turner; 1775-1851; British; ca. 1845; Graphite and watercolor on medium; slightly textured; white wove paper; Binding: 4 inches (10.2 cm); Cover: 4 x 6 5/8 inches (10.2 x 16.8 cm); and Sheet: 3 3/4 x 6 1/4 inches (9.5 x 15.9 cm); channel (water body component); marine art; sketchbook; sketches; Boulogne; English Channel; Europe; Folkestone; France; La Manche; United Kingdom