Conical Boiler
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“Rogers’s Conical Boiler, which has long been in use, is very suitable for heating pits and small houses, since it is economical of fuel, and gives out a steady heat for a long time, 15 to 20 hours.” — Encyclopedia Britannica, 1893
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Heating and CoolingSource
The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)
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