. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. be drawn from the centre of the arch. The length thereof ought not tobe less than one and a half of its bottom breadth, nor more than double. 886 PRACTICE OF ARCHITECTURE. Book III. 2G27. Tlie ratios that have been deduced by comparing the void and solid parts, if therebe anv reason in the considerations had, show that this law of making arches in arcades ofthe heifht of 2 diameters is not empirical, the following being the results of the use of the
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. be drawn from the centre of the arch. The length thereof ought not tobe less than one and a half of its bottom breadth, nor more than double. 886 PRACTICE OF ARCHITECTURE. Book III. 2G27. Tlie ratios that have been deduced by comparing the void and solid parts, if therebe anv reason in the considerations had, show that this law of making arches in arcades ofthe heifht of 2 diameters is not empirical, the following being the results of the use of theratios in the arcade without, and that with pedestal, of which we shall presently treat. Thusin the Tuscan arcade without pedestal,Doric arcade without pedestal,Ionic arcade without pedestal,Corinthian arcade without pedestal. 13-5 height e-5 width 140 7 710 18 00 7 76 Diameters. Diameters 175= 2-0; with pedestals,-n7c= 1 84 = 2-0 — = 2-3 — 100-^ uu2-0 2628. In the examples of the arcades with pedestals, we shall again repeat the process bjrhich the results are obtained, first merely stating them in round numbers. i-Vy. Jo3 is a. a 10 1 12 13 U Moiules Ftg. 913 Tuscan arcade from Vignolas example, as will be tlie following ones. In this the wliolearea is 306, omitting fractions, the area of the void is 156, that of the entablature .30,and the supports 100. The ratio of the supjxjrted part (the entablature), therefijre,*^ TO= •5 and the supports and weights are very nearly efpial to the void The height ofthe pedestal is almost 3 modules and 8 parts, the opening 9 modules 6 parts, and thewidth of tlie whole pier 4 modules and 3 detail of tlie above result is as follows . — The whole area, 22*30 X 13-75 - - - _ =30662 Area of semi-arch, ^?^^^?^^-^-^ ^ Below that, 12-75 x 9 75 Entablature, 13*75x3-66 -Leaves for supporting parts :121-12Total voids, therefore^ : 156-55 150-07: 50-82 99-75 CiiAr. I. ARCADES AND ARCHES. 88 It will be seen tliat we have t
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