. Transactions. openings orflues, connected with the central flue. The radial flues have adiameter of about 5 in. and are built with a gentle upwardslope. The stack (shown in Fig. 1) is permanent; and in thisrespect the practice in Peru differs from other primitive prac-tices in which nothing is permanent except the yard. Above the permanent 6-ft. portion of the stack there is addeda cap of clay, about 3 ft. high, which contracts toward the top,where it has an inside diameter of about 2 ft. This clay capis temporary, and frequently has to be renewed after eachburning. Before charging the coal,
. Transactions. openings orflues, connected with the central flue. The radial flues have adiameter of about 5 in. and are built with a gentle upwardslope. The stack (shown in Fig. 1) is permanent; and in thisrespect the practice in Peru differs from other primitive prac-tices in which nothing is permanent except the yard. Above the permanent 6-ft. portion of the stack there is addeda cap of clay, about 3 ft. high, which contracts toward the top,where it has an inside diameter of about 2 ft. This clay capis temporary, and frequently has to be renewed after eachburning. Before charging the coal, there are first built, from the low-est tier of flues upon the ground, a number of temporary flues,leading from the central stack out to the edge of the coal-heap,and constructed of blocks of coal for the greater part of thedistance, the outer edge alone being of rough stone. The coalis then piled up over these flues and around the stack to aheight of about 6 ft. The bottom flues are the only ones that Permanent Central Stack of Coke Heap, Showing Openings lnto Flue, quishuarcancha, peru. Fig. 2.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
