a boiler which contains an inclosed fire box and a large number of small flues leading to the chimney.
See also: Boiler
locomotive boiler
locomotive boiler
[‚lō·kə′mōd·iv ¦bȯil·ər] (mechanical engineering) An internally fixed horizontal fire-tube boiler with integral furnace; the doubled furnace walls contain water which mixes with water in the boiler shell.