Wind-sail

A long funnel-shape canvas leading below through one of the hatches, kept spread by wooden hoops, and used for sending fresh air below decks. An opening in its upper part, or head, admits the air which is gathered by two large canvass-flaps or ears, standing out on each side, and trimmed by bowlines. The windsail hoists by halliards, and is slued around as often as necessary to face the wind.