Carpentry for Boys / In a Simple Language, Including Chapters on Drawing, Laying Out Work, Designing and Architecture With 250 Original Illustrations

by James Slough Zerbe

Fig. 225.

Fig. 226.

The Roof.—The pitch of the roof (Fig. 225) is what is called "third pitch," and the roof (Fig. 226) has a half pitch. A "third" pitch is determined as follows:

Roof Pitch.—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."

Fig. 227.	Fig. 228.