from The Century Dictionary and Cyclopedia
- n. The reverse of a return-flue; a flue for conducting hot gases from the front to the rear end of a boiler.
Sorry, no etymologies found.
The arrows show its descent through these flues, from which it obliquely strikes and passes over the flue-plate, then under it, and then out through the centre back-flue, which is open at the bottom, up into the smoke-pipe.
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