aquatint (mezzotint?)

Handcolored aquatint (or mezzotint), mounted on cardboard, from "R. Ackermann's Yachting Scraps", plate 3, "Yachts on a wind", printed across bottom "Drawn by W.A. Knell. London: Published April 20, 1850, by Rudolph Ackermann, at his Eclipse Sproting & Military Gallery, 191 Regent Street. Engd. by J. Harris." Scene shows cutter yachts (probably British) under sail, probably racing.