A small case, in which is placed the compass-box. It is fixed to the deck in front of the steersman, and is furnished with glazed apertures to admit light upon the compass, and exclude rain in the day, and at night is lighted up by a lamp placed within it. These lamps are variously constructed sometimes a hole is cut through the deck immediately below the compass, and a lamp is so placed as to give light to the compass and the cabin also; in this case the card of the compass is formed of a semi-transparent material.