Mast. A long piece, or system of pieces, of timber, placed nearly perpendicularly to the keelson of a vessel to support the spars and gear by which the sails are set. In modern practice, steel masts are built by riveting rolled plates together.
Midships. Middle part of a ship.
Mizzen-mast. Third mast on a vessel with three or more masts.
Mizzen-sails. Sails carried on a mizzen-mast.
Mushroom Ventilator. Short cast-iron tube with movable iron rod passing through the center. A metal cup is fitted to the top of the rod, which may be lifted to permit air to enter, or closed to prevent water from entering. Generally fitted over cabins.
Navigation Bridge. Bridge used for taking observations or handling the ship in difficult situations.
Outboard. Outside the hull or beyond the gunwale.
Outlet cock. Any cock used to free a receptacle of water.
Paddle-wheels. Wheels fitted on each side of a paddle steamer in connection with the paddle-shaft, consisting of a cast-iron boss from which wrought-iron arms radiate, strengthened by rims and stays, and with a float attached to each arm.
Pawl. Small catch to prevent moving object from going beyond certain limit.