the fire, but ensures a very Improved Tubular Boiler. on one side, or its interior surface, while the tions within the boiler. The tubes being energetic circulation of the water in contact The boiler represented in the accompanying tube has the heated water on one side, (its ex copper or brass, for… … ly in the furnace, enabling the air to pass = * through its interstices freely, and it burns in > ____Walerlevel____ = such a manner that a portion of the fuel is decomposed, or changed into gas, to be burned as it escapes through the tubes, while another large portion is burned as it lies in the…
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