. The Crystal Falls iron-bearing district of Michigan. Iron ores; Geology; Geology, Stratigraphic; Geology, Stratigraphic. 354 THE CRYSTAL FALLS IRON-BEARING DISTRICT. It is also interesting- to determine the relative values of the horizontal components at the two maximum points, for different angles of dip, and for different ratios of /; to a—that is, for different depths of burial. Fig. 18 shows in graphical form these relations for all angles of dip between 90° and 0° for seven different ratios between h ^ ^7. and h =z 4«. The ordinates 50 to the dotted curves (concave upward) give the rela
. The Crystal Falls iron-bearing district of Michigan. Iron ores; Geology; Geology, Stratigraphic; Geology, Stratigraphic. 354 THE CRYSTAL FALLS IRON-BEARING DISTRICT. It is also interesting- to determine the relative values of the horizontal components at the two maximum points, for different angles of dip, and for different ratios of /; to a—that is, for different depths of burial. Fig. 18 shows in graphical form these relations for all angles of dip between 90° and 0° for seven different ratios between h ^ ^7. and h =z 4«. The ordinates 50 to the dotted curves (concave upward) give the relative values of the hori- zontal component at the maximum point on the dip side (B maximum); those to the full cur^'es (convex upward) the values at the maximum point. 90^ 80" 70J 60° 50° 40° 30° 20o IQo 0° Flo. 18.—Curves showing the relations between the horizontal components at the points of luaximum deliectioo, lor rocks dipping at various angles and buried to various depths. on the other side of the rock (A maximum). These curves show that the horizontal component at the B maximum is always numericallv much less than at the A maximum, and that for moderate depths of burial it diminishes very rapidly at both points with small ang-les of di]). 6. DETERMINATION OF DEPTH. The relations between the dip and thickness of a magnetic rock, the distance between the horizontal maxima, and the depth of covering are given in equation (13). By assuming numerical values for ^, and either for a, the half thickness of the rock, or for r/, the half distance between the maximum points, it is easy to plot the curve which expresses the relations. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Clements, Julius Morgan, 1869-; Smyth, Henry Lloyd, 1862-; Bayley, William Shirley, 1861-1943. Washington, : Govt. P
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