fireboard

[Eng. fire, and board.] A chimney-board, to close up a fireplace in summer. chimney-board, to close up a fire-place in summer. fire-boat, s. [Eng. fire, and bou..] A steamboat equipped with apparatus for extinguishing fires among shipping and along river fronts. fire-box, s . [English fire , and box .] The fire chamber of a locomotive-boiler. It is jacketed with a water-chamber to prevent radiation of heat. The firebox door may also be double, and have a circulation of water through the hinges. A partition in the box sometimes divides the fire space into two parts, and, being full of water, increases the fire surface. firebox-door, s. The door opening into the firebox by which fuel is supplied to the fire.