The essentials of descriptive geometry . Discussion. The vertex of the given angle will he on the giventrace and the angle will lie in a plane perpendicular to the giventrace. This angle may, therefore, be constructed and since one 8o ESSENTIALS OF DESCRIPTIVE GEOMETRY side of it lies in the required plane the piercing point of this sidewill lie on the required trace. Construction. Let the problem be, Fig. 63, to find the planeof the ore body whose strike is the line sS (the strike is the. Fig. 63. direction of any horizontal Hne in the plane) and whose dip is60 degrees (the dip is the incKnat
The essentials of descriptive geometry . Discussion. The vertex of the given angle will he on the giventrace and the angle will lie in a plane perpendicular to the giventrace. This angle may, therefore, be constructed and since one 8o ESSENTIALS OF DESCRIPTIVE GEOMETRY side of it lies in the required plane the piercing point of this sidewill lie on the required trace. Construction. Let the problem be, Fig. 63, to find the planeof the ore body whose strike is the line sS (the strike is the. Fig. 63. direction of any horizontal Hne in the plane) and whose dip is60 degrees (the dip is the incKnation of the plane to the hori-zontal). Lay off an angle of 60 degrees with its vertex o on sS PROBLEMS ON POINTS, LINES, AND PLANES 8l and one side OP perpendicular to sS. Pnop will be the revolvedposition of the given angle the ore body makes with H, and Phwill be the revolved position of the point where OP pierces the Hne OP must lie in the plane of the ore revolve the angletill it is perpendicular to H, and Ph will fall at a point shown inplan and in elevation at p and p. P, then, is a point in sS,the required trace.
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192400462, bookyear1915
