In Fig. 227 draw a vertical line (A) and join it by a horizontal line (B). Then strike a circle (C) and step it off into three parts. The line (D), which intersects the first mark (E) and the angle of the lines (A, B), is the pitch.
In Fig. 228 the line A is struck at 15 degrees, which is halfway between lines B and C, and it is, therefore, termed "half-pitch."
Thus, we have made the ground plans, the elevations and the roofs as simple as possible. Let us proceed next with the details of the building.
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