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• <br />figure 9.2.4 in Peng, reproduced below, is used <br />to determine the fraction of the seam height that <br />will be the maximum subsidence. <br />CAVING OR STRIP PACKING <br />mIE <br />SOLIO STOWING <br />u <br />0 0.2 0.4 0.6 0.8 I.0 1.2 1.4 I.6 1.8 2.0 2.2 <br />Width / Depth <br />Fip. 9.2.4 Maximum possible euDeidanea vsraus type of suppat(12 ). <br />Courtesy U. K. Nafionol Caal Board. <br />From the curve for caving or strip-packing, the <br />ratio of subsidence to seam height is found to be <br />0.9. <br />Thus, maximum subsidence = 0.9 x 5.5 feet <br />= 4.95 feet. <br /> <br /> <br />564 <br />D. H. EMLING COMPANY <br />