. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. \^^^^ Fifi. .) EQUILIBRIUJI OF ARCHFS. 1374. The resistance of each parallelepiped represented l)y the prism ABDE (fig. .565.)being equal to half their weight, it follows that the weight to be sustained by tlie two ])rismsshould eijual one quarter of the two parallelopipeds taken together, or the half of one,which is confirmed by the experiment. This agreement between theory and jiractice deti r-mined Kondekt to apply the hypothesis to models o
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. \^^^^ Fifi. .) EQUILIBRIUJI OF ARCHFS. 1374. The resistance of each parallelepiped represented l)y the prism ABDE (fig. .565.)being equal to half their weight, it follows that the weight to be sustained by tlie two ])rismsshould eijual one quarter of the two parallelopipeds taken together, or the half of one,which is confirmed by the experiment. This agreement between theory and jiractice deti r-mined Kondekt to apply the hypothesis to models of vaults composed of voussoirs and wedgesdisunited, made of freestone, with the utmost exactness, the joints and surfaces nicely wrought, as tiie parallelopipeds in the preceding example. 1375. The first model was of a semicircular arch 9 inches diameter,comprised between two concentric semi-circumferences of circles 21 linesapart. It was divided into 9 equal voussoirs. This arch was 17 linesdeep, and was carried on piers 2 inches and 7 lines thick. It was found,by gradually diminishing the ])iers, which were at first 2 inches and 10lines thick, that the thick
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