Most Coffin heaters were in the form of a bent box to conform to the shape of the boiler. They could be mounted externally, on the front of the smokebox (B&M Berkshires) or internally, within the smokebox (some NYC Hudsons)> All heaters worked basically the same: they took water from the tender, heated it with boiler steam, and pumped it into the boiler already hot, to increase the efficiency of the steam-making process. Sinc they had to overcome the pressure within the boiler, they were very sturdy affairs. Randy Brown - -------------------------------------------------------------- Coffin made feedwater heaters also, a weird horseshoe-shaped tube that was mounted in front of the smoke box, not sure how this device worked. T The Erie Lackawanna Mailing List Sponsored by the ELH&TS http://www.elhts.org ------------------------------
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