smokeboard

A board placed against a fireplace to keep smoke from i uing into a room. smoke-box, s. Steam : 1. A chamber in which the smoke and heated gases of the flues are collected, and from which they pa to the chimney, funnel, or stack. Some forms of reverting-flue boilers have smoke-boxes at each end. 2. In locomotives, the end of the boiler on which the chimney is placed. It receives the draught from the tubes. Locomotives with inside cylinders have them placed in this box, which keeps them and the steam-pipes at a high temperature. *smoke-cloud, s . A cloud of smoke.