aquatint (mezzotint?)

Handcolored aquatint (or mezzotint), mounted on cardboard, from "R. Ackermann's Yachting Scraps", plate 4, "The Bianca, Schooner Yacht, Close Hauled", printed across bottom "Drawn by W.A. Knell. London: Published April 20, 1850, by Rudolph Ackermann, at his Eclipse Sporting & Military Gallery, 191 Regent Street. Engd. by J. Harris." Scene shows port view of schooner yacht BIANCA under sail, another schooner to starboard.