Exercise 9—Third Angle. Draw the plan and elevation of a right triangular pyramid, placed with its axis parallel to both V and H, with the apex at the left of the base. Locate the axis of the pyramid 3 inches from H, and 21/2 inches from V. The axis is to be 4 inches long, and the base is to be an equilateral triangle 2 inches on a side. Let the lower front edge of the base incline at 45 degrees with the horizontal plane.
Exercise 10—First Angle. Draw the plan and elevation of a regular hexagonal pyramid, with its axis parallel to both V and H, and with its apex at the right of the base. Place the lowest corner of the base on the H plane, and make the lowest front edge of the base at an angle of 15 degrees with H. The axis of the pyramid is 5 inches long, and each edge of the base is inches.
Exercise 11—First Angle. Draw the plan and elevation of a rectangular prism 5 inches by 2 inches by 11/2 inches, when the long edges are horizontal and are placed at an angle of 45 de grees with V, backward and to the left. Make the lower front face one of the wide ones, and let it make an angle of 30 degrees with H.
Suggestion—An end view must first be drawn.
Exercise 12—First Angle. Draw the plan and elevation of a right circular cylinder of 2 inches diameter and 5 inches length. The cyl is placed in a horizontal position, making 45 degrees with V, backward and to the right.
Exercise 13—Third Angle. Make three drawings of a regular hexagonal pyramid of which the altitude is 4 inches, and the edge of the base inches. In the first figure, make the plan and elevation showing the base hori zontal, and the apex above the base; and place the left-hand front edge of the base at 45 degrees with V. In the second figure, show the projec tions after the pyramid has been revolved through 45 degrees about an axis perpendicular to V, so that the axis of the pyramid slopes downward and to the left. In the third figure, revolve the plan of the preceding figure through 30 degrees clockwise, and construct the cor responding elevation.
Exercise 14—First Angle. Draw the plan and elevation of a right circular cone in three positions. The diameter of the base is 3 inches, and the altitude is 4 inches. In the first posi tion, draw the plan and elevation with the cone standing on the apex, and with the base horizontal. In the second position, draw the plan and elevation after the cone has been re volved through 60 degrees about an axis per pendicular to V, so that the axis of the cone slopes downward and to the right. For the third position, revolve the plan of the second position counter-clockwise through 45 degrees about a vertical axis, and construct the corresponding elevation.