Descriptive geometry . HIP RAFTER. Determine length—down cut-heel cut— side cut — top bevel. JACK RAFTER. Determine side cut. PURLIN. Determine down cut — side cut-angle between face and end. Determine the bevels, cuts, and lengths of roof members, as above. (Art. 87, page OO, inch. Space required for the problem, 7 x lO inches, PLATE 20. Determine angle of cut on top of purlin (A). Bevel on web of purlin (B). Angle bet-w^een plane of -web of hip rafter and purlin, orbend of gusset (C). Angle between top edges of gusset (D). (Art, 87, page 61.) Unit of measure, i inch. Space required for each
Descriptive geometry . HIP RAFTER. Determine length—down cut-heel cut— side cut — top bevel. JACK RAFTER. Determine side cut. PURLIN. Determine down cut — side cut-angle between face and end. Determine the bevels, cuts, and lengths of roof members, as above. (Art. 87, page OO, inch. Space required for the problem, 7 x lO inches, PLATE 20. Determine angle of cut on top of purlin (A). Bevel on web of purlin (B). Angle bet-w^een plane of -web of hip rafter and purlin, orbend of gusset (C). Angle between top edges of gusset (D). (Art, 87, page 61.) Unit of measure, i inch. Space required for each problem, 21 x 3 inches. Angles between GL and traces ofplanes, multiples of 15°. Measurements from GL, in light type, and from right-hand division line, in heavy type. PLATE 21 1 ^ 2 eowith H. 75°with H. ^ 45°with H. 3 0 with V. HN 7 5 7 / 7 7 8 HH ^^^ 60°with H. 60with H. 60with V. 30°with V. 9 10 II 12 eowith V. 45with H. 75°with °with V. 30°with V. QO^with ^with V. Problems 1-8,Problems 9-12. Determine one position of the missing trace of plane the traces of plane S making the given angle (Arts. 88, 89, page 62.)3 with V and H. (Art. 90, page 62.) Unit of measure, J inch. Space required for each problem, 7 x lO inches. PLATE 22
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