Saddle Boiler

“The fire is made under the principal arch a; the flame and smoke return through the flue b, and then turn back over the top of the boiler to the outlet c, which can be placed at whatever point is in each case most convenient. The other parts referred to are d, flow pipe; e, return pipes, f, soot-door for cleaning flues, g, furnace door.” — Encyclopedia Britannica, 1893

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