Admiralty carriage mount for a British 18-pounder <a href="https://en.wikipedia.org/wiki/carronade" class="extiw" title="en:carronade">carronade</a>
unattributed, apparently from U.S. National Archives
Scanned from Chappelle, Howard I., <i>The History of the American Sailing Navy: The Ships and Their Development</i>, New York: W. W. Norton and Company, Inc., 1949, <a href="//commons.wikimedia.org/wiki/Special:BookSources/1-56852-222-3" title="Special:BookSources/1-56852-222-3">ISBN 1-56852-222-3</a>, Plate VII, facing p. 152