. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. Til. MASONRY. 597. 1957. Jf/ien ruches in/ersect an inclined vault, and the projections of the arrisses cross?Mch other at riyht angles, and the angle of elevation of one of the semicircular vertical ribsof the ascending avenue or opening is given to ohtain the geometrical construction; so thatthe cross arches may be cylindrical the straiglit line A15 (fg. 645.) toluijiescnt the axis of the inclined vault, anddraw CD perpendicular to A
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. Til. MASONRY. 597. 1957. Jf/ien ruches in/ersect an inclined vault, and the projections of the arrisses cross?Mch other at riyht angles, and the angle of elevation of one of the semicircular vertical ribsof the ascending avenue or opening is given to ohtain the geometrical construction; so thatthe cross arches may be cylindrical the straiglit line A15 (fg. 645.) toluijiescnt the axis of the inclined vault, anddraw CD perpendicular to A 13. IroduceCD to e and /; ; make AC and AD eachequal to the radius which forms the edgesof the ribs ; draw /tN parallel to AB, andmake the angle N/(o ecjual to the inclinationof the axis represented by its i)lan A 15. Inthe line ho take any point p, and draw qrparallel and ps perpendicular to hN. Wakeps e(]ual to AC or AD, and through « drawiJ parallel to ho. Draw pii perpendicularto Ijt, cutting it in u. Produce pu to the circumference of the inclined vaultfrom u to V, divided into the equal parts ?<, 1,1,2; 2,3; 3v, at the points 1, 2, 3. Divid
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Keywords: ., bookcentury1800, booksubjectarchitects, booksubjectarchitecture
