Cyclopedia of architecture, carpentry, and building; a general reference work .. (1912)
American School (Lansing, Ill.) · Chicago, American school of correspondence · leaf 435
he diagram it is shown howto find the length of a jack rafter if placed 16 inches from center tocenter. The method is to move the square as shown along the line ofthe blade until the blade measures 16 inches; the tongue then would beas shown from w to m, and-the length of the jack would be from 12… … Fig. 28. Finding Length of JackRafter in %-Pitcli Roof.
Architecture · Building
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