. Cyclopedia of architecture, carpentry, and building; a general reference work .. . Fig. 28. Finding Length of JackRafter in %-Pitcli Fig. 39, Method of Determining Length of Jacks Between Hips and Valleys;also Bevels for Jacks, Hips, and Valleys. 18 inches it will become necessary to use two squares; otherwise thetongue as shown at m would not reach the edge of the timber. In Fig. 28 the same method is shown for finding the length of ajack rafter for a roof rising 9 inches to the foot of run, with the jacksplaced 18 inches center to center. The square in this diagram isshown placed on
. Cyclopedia of architecture, carpentry, and building; a general reference work .. . Fig. 28. Finding Length of JackRafter in %-Pitcli Fig. 39, Method of Determining Length of Jacks Between Hips and Valleys;also Bevels for Jacks, Hips, and Valleys. 18 inches it will become necessary to use two squares; otherwise thetongue as shown at m would not reach the edge of the timber. In Fig. 28 the same method is shown for finding the length of ajack rafter for a roof rising 9 inches to the foot of run, with the jacksplaced 18 inches center to center. The square in this diagram isshown placed on the jack rafter timber with 12 on blade and 9 on 361 20 THE STEEL SQUARE tongue; then it is moved forward along the Hne of the blade to blade, when in this latter position, will measure 18 inches. Thetongue will meet the edge of the timber at m, and the distance fromm on tongue to 12 on blade will indicate the length of a jack, or, inother words, will show the length each jack is shortened when placed Miter Bevel for Boards BeveTtocutthe Boar
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