s, and are prevented. There are curved partitions within the ring portion as Fig shown in Fig. 4, for the purpose of aiding the circulation of the water. The column of water next the furnace is being constantly converted into mingled steam and water which being lighter than the solid columns of… … brought in contact with the heated sides of the surface, the not subject to unequal con- steam being carried to the chamber above, where it separates traction and expansion either from the water and rises into the steam space, while the solid by the heat of the boiler or water returns to the other…
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