. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 29.—The Root Boiler. is considered more advantageous to increase their number than to increasetheir dimensions. The Root Boiler.—The difficulty of transporting large and heavyboilers of the Lancashire, Cornish, and Locomotive types across country, 46 MACHINERY FOR METALLIFEROUS MINES. especially where there are no roads, is obvious, and is not a task to belightly undertaken. Fortunately the choice of a boiler does not lieamongst these already mentioned, and for general min
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 29.—The Root Boiler. is considered more advantageous to increase their number than to increasetheir dimensions. The Root Boiler.—The difficulty of transporting large and heavyboilers of the Lancashire, Cornish, and Locomotive types across country, 46 MACHINERY FOR METALLIFEROUS MINES. especially where there are no roads, is obvious, and is not a task to belightly undertaken. Fortunately the choice of a boiler does not lieamongst these already mentioned, and for general mining work, especiallyin out-of-the-way places, a boiler or nest of boilers of the well-knownRoot type, shown in fig. 29, and made by Messrs. Conrad Knap & Co.,of London, is very suitable. These boilers, even of the largest size, aremade in several parts on the interchangeable principle; and when required. Fig. 30.—Standard Single Multitubular Boiler. the heaviest pieces can be made to weigh less than 200 lb. each, whichcan be put together by unskilled labour without riveting or the use ofspecial tools. As will be seen from the illustration, the steam generating portion ofthis boiler consists entirely of wrought iron or steel tubes containingwater, and enclosed in an outside casing, either of bricks or iron, thelatter material being used where the former are difficult to obtain. Each tube is fitted with a box or flange at both ends, jointed toeach other by hollow connecting pieces. Cross-pipes top and bottomjoin the vertical tiers of tubes, and a massive iron framework supportsthe whole, entirely independent of masonry. AMERICAN TYPE OF BOILER. 47 The tubes are piled zig-zag to ensure a thorough breaking up of thefire-gases, and the steam space is formed either by tubes, same as thegenerating portion of the boiler, or by drums of large diameter. The furnace is arranged underneath or i
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