. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. inder 111lines is the thickness sought. 1426. It maybe here observed, that in carrying up thewalls above, if they are set back from the vertical B Fin fif, the model required their thickness to be only 6lines, because this species of false bearing, if indeed itcan be so called, increases the resistance of the piers. This was a practice constantly resorted to in Gothicarchitecture, as well as that of springing pointed archesfrom cori)els, for the pur
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. inder 111lines is the thickness sought. 1426. It maybe here observed, that in carrying up thewalls above, if they are set back from the vertical B Fin fif, the model required their thickness to be only 6lines, because this species of false bearing, if indeed itcan be so called, increases the resistance of the piers. This was a practice constantly resorted to in Gothicarchitecture, as well as that of springing pointed archesfrom cori)els, for the purpose of avoiding extra thicknessin the walls or piers. Anoi ) Aiipllcatiirt of the Piincipes to a differentlycunstnwted Arch. 1427. The model (^i;. 581.) represents an arrh of 11voussoirs whereof 10 are with crossettes or elbows, whinhgive them a bearing on the adjoining horizontal coursss;tlie eleventh being the keystone. The opening is 9 inchesor 108 lines, as in the preceding examjjles. 1428. Having drawn the lines BF, FC, the secant FO,and the horizontal line IKL, independent of the fivecourses above the line FC of the extrados, we have. ^ 372 lIlKOltY OF ARCIIITKCTUHE. HCOK II. KI. = :«()-:^ ]K = i;!-27 ()C=BF _ 78-00 The arc KD = fiSTO The arc KB = 52 15 KG = ;5;5-59 a, the height of the pier, =198-00. The area KFCL of the upper part of the arch will be 1223-10, from wliich suhtractliiothat of the triangle FKG, whicli is 590-82, the remainder 832-28 being multiplied by30-73 and divided by 32-7 makes the etlbrt of this part 782-44. H29. Til J area of the lower part is 697-95,to which adding the triangle FKG =390-82,we have lOSS-77, whicli multiplied by 23-27 and divided by 52-15, gives 485-82 for itseffoit. The expression of the thrust, represented hy p in the formula, T= V 2p — ~^ + ^2 — „ being equal to the difference of these two efforts, will be 29G-62, and twice pd, re))resenting KG, being W2 have 2joc?= 199i(;-93, and = 593-24= 33-59 = 100-64 h, representing t
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