This US Navy long boat was sketched at come point during the Civil War by sketch artist Alfred Waud.  Also featured is a rough outline of a sailor.  These small boats were very important to transfer officers and men from ship to ship, to land soldiers and sailors on land, and to serve as lifeboats if a ship sank.  It seems odd for Waud to have sketched such a simple thing, but a surprising percentage of his sketches are of ships or otherwise nautically themed indicating that he had an interest in drawing them to pleasure as opposed for his employer Harper's Weekly.