Bulletin of the Geological Society of America . OO DEPTH 3CALE FOR MICHK3AN 3,ODD. FiGUKB 1.—Diffeienvea from deepest a-ra4ient ire Jfl«ftj(;o>i Probability curve In left corner. Figure 1 shows by the heavy black area In the lower left corner the probability curve(1 —Pm), unity for m being Indicated hy a distance. The same distance from left toright as the depth of 1,000 feet, and in ordinates 10 degrees Fahrenheit, and the circlesindicate the number of degrees by which the actual rocit temperatures observed at depthscorresponding to the abscissas are In excess of those which might be expec
Bulletin of the Geological Society of America . OO DEPTH 3CALE FOR MICHK3AN 3,ODD. FiGUKB 1.—Diffeienvea from deepest a-ra4ient ire Jfl«ftj(;o>i Probability curve In left corner. Figure 1 shows by the heavy black area In the lower left corner the probability curve(1 —Pm), unity for m being Indicated hy a distance. The same distance from left toright as the depth of 1,000 feet, and in ordinates 10 degrees Fahrenheit, and the circlesindicate the number of degrees by which the actual rocit temperatures observed at depthscorresponding to the abscissas are In excess of those which might be expected from thetemperatures and the gradient at the bottom of the mine. FiGDEE 2.—Temperatures in Michigan Figure 2 shows to the same depth scale, running from left to right, the temperatures(referred to the scale on the left) for various depths In Michigan copper mines, byhollow circles with a radius equivalent to one degree. Half circles Indicate a greaterrange of probable temperature. The heavy black line Indicates the bottom gradient,one degree Fahrenheit in 90 feet Fig
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
