Higbee, F. G · New York, John Wiley & Sons · leaf 91
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… … 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…
Geometry, Descriptive
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