A treatise on architecture and building construction . side to be well supported by studs. The under side of the rafters, where they project beyondthe plate, is sometimes lined, or sheathed, with a board / ucalled the ijlanclier, or soffit, and the ends of the rafters ate ti are then faced with a board called the facia. The propercurvature of the edges of the plancher df\^ found by draw-ing the line dg parallel to the inside of the rafter, and at adistance from it equal to the thickness of the plancher; thisline will intersect the axis h c of the roof at g ; then, with gas a center and radii ^
A treatise on architecture and building construction . side to be well supported by studs. The under side of the rafters, where they project beyondthe plate, is sometimes lined, or sheathed, with a board / ucalled the ijlanclier, or soffit, and the ends of the rafters ate ti are then faced with a board called the facia. The propercurvature of the edges of the plancher df\^ found by draw-ing the line dg parallel to the inside of the rafter, and at adistance from it equal to the thickness of the plancher; thisline will intersect the axis h c of the roof at g ; then, with gas a center and radii ^</and gd\ describe the arcs rt/and / df\ which will give thecurvature required. Thelength of the plancher onthe line df will, of course,be equal to the circumfer-ence of the roof at d. The roofing boards overthe rafters are applied inthe same manner as is de-scribed hereafter, in con-nection with the coveringof domes, ilhistrated, sub-sequently, in Art. 145. Where a conical roof intersects the pitch of Fio. 50. another roof, it is necessary. CARPENTRY. 77 to resort to particular framing- in each case. Fig. 56 showsthe plan of a conical tower roof ahc^ intersecting a flat sin-gle slope efJig^ the line of intersection being the curve a Fig. 57 the plan A of the tower is divided into sixteen
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Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
