cription have been in use, we are in- temperature of a boiler furnace is about 2,000° Fah., while boiler, which is claimed to contain a number of important that of steam and water at 70 pounds pressure is but 316°. formed, for years, and are never cleaned, making steam as advantages, and which,… … usual way. Large manholes are provided in all the drums The Virginia Gold mines. Fig. 8.—THE FIBMEOTCH SAFETY STEAM BOILER. to admit of easy access to the interior of the boiler. Mr. J. E. Emerson, a valued correspondent of this jour- Among the advantages claimed by the manufacturers are nal, who…
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