Descriptive geometry for students in engineering science and architecture; a carefully graded course of instruction . Fig. must be found for the axis, since there are two angles to be taken into consideration,namely, the angle a° which it makes with the and the 30^ angle it makes withthe \.P. In the fmal position, therefore, the plan oi the axis is made parallel tothe arrow line obtained by compounding these angles. 34 DESCRIPTIVE GEOMETRY In Fig. 34 there is no compound angle problem required to be worked right circular cone is represented with its axis at 45° to the , and the
Descriptive geometry for students in engineering science and architecture; a carefully graded course of instruction . Fig. must be found for the axis, since there are two angles to be taken into consideration,namely, the angle a° which it makes with the and the 30^ angle it makes withthe \.P. In the fmal position, therefore, the plan oi the axis is made parallel tothe arrow line obtained by compounding these angles. 34 DESCRIPTIVE GEOMETRY In Fig. 34 there is no compound angle problem required to be worked right circular cone is represented with its axis at 45° to the , and the hori-zontal diameter of its base is at 50° to the Notice that in drawing the linesfor the sides of the incHned cone, where an ellipse is part of the drawing, these sidelines are tangent to the curve of the ellipse, and do not run into the ends of themajor axis of the ellipse. It will be advisable to draw the line ee the full length. Fig. 34. of the diameter of the base, at right angles to the elevation obtained of the axisof the cone. In finding the plans and elevations of circles inclined, not less thaneight points in the curve should be found. EXERCISE XV 1. Find the plan and elevation for a cube, 2 edge, which has one edge in the at 60°to XY, and a face adjacent to that edge at 30° to the 2. A pentagonal prism has one short edge, ij long, in the The long edges, 3 long,are at 45° to the and at 25° to the Find the plan and elevation. 3. A hexagonal pyramid, base edge i, axis 3, has one triangular face in the , andthe horizontal diagonal of the base is at 45° to the Find the plan and elevation. 4. A right circular cone, diameter of base 2, axis 3, lies on its side on the , with itsapex therefore in the Find the projections for it when its axis is at 30° to the 5. Propose and work out other problems, for example, on the square prism, the cylinder,the pentagonal
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