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60th day air temperatures anchored anemometers Average displacements borescope Bureau of Mines caved zone Corp.'s York Canyon critical value crosscut Data from displacement Data set detection of loose differences between loose displacement gages erated rate failure falling rock feet floor heave four roof gages gages using readings idle days inch on gage infrared scanner infrared thermometer investigation Kaiser Steel Corp.'s loose and solid loose rock measure displacement measured by gage Mercury thermometers mining operations nearby mine openings nearest 0.01 inch null hypothesis number of gages personnel pillar pointers Raton Reference pin holes Remote sensing roof and ribs roof rock safe location second pin short data Shortened sample shown in figures siltstone slabs smoke tubes solid rock stainless steel scale Stateham Steel Corp.'s York temperature differential temperature measurements test area test opening test statistic thermal anomalies total displacement measured U.S. Bureau unsupported roof Weekend Workday Ratio York Canyon coal York Canyon sandstone