A treatise on architecture and building construction . he angle e h inof the jack-rafter i in would be on the bottom of the rafter,and not the top, as with the hip-rafter. 139. The hip-and-valley roof in Fig. 50 is, in outline,precisely the saiue as the roof in Fig. 49, but in its plan ofconstruction it has no gables. The four ends of the two par-allelograms forming this planhave each two hips, as at x r—eight altogether—and thereare four valleys, zs, zin, zn,and za, with two ridges, x xand b b. If we now draw xtgand x /, each at right anglesto X x and equal to the heightof roof, and connect t
A treatise on architecture and building construction . he angle e h inof the jack-rafter i in would be on the bottom of the rafter,and not the top, as with the hip-rafter. 139. The hip-and-valley roof in Fig. 50 is, in outline,precisely the saiue as the roof in Fig. 49, but in its plan ofconstruction it has no gables. The four ends of the two par-allelograms forming this planhave each two hips, as at x r—eight altogether—and thereare four valleys, zs, zin, zn,and za, with two ridges, x xand b b. If we now draw xtgand x /, each at right anglesto X x and equal to the heightof roof, and connect t t^ theelevation of the ridge, with gand g, we have in gtf g avertical section of the roof onthe line gg. Now, if we draw z e equal \.o zo and connectcm and ca, we have, at mca, a vertical .section of the roofvalleys zm, za. To obtain a vertical section of the roofthrough in ti, we make // h equal to the height x t and con-nect h in and h n. The lengths and cuts of the hip-and-valley rafters can now be found according to the methodsalready Fig. 50. 140. The g:aiTil>Tel roof is shown in Fig. 51; theterm gainbrcl signifies a bend, or crook, and in this case 72 CARPENTRY.
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