Byzantine and Romanesque architecture . 9. ^ Choisy, I/tsi. dArchit. I. 125. CH. Ill] DOMES AND VAULTS 39 A far more scientific and beautiful way was by the Thespherical pendentive, the discovery of which constitutes p^ndentivethe triumph of Byzantine architecture. It is arrived atin this manner. A BCD (Fig. lo) is the square and theinscribed circle E the dome to be placed over it. Imagine. Fig. lo. a larger dome FGHI circumscribed about the if the four segments ABG, BCH and the othertwo are cut off vertically on the lines AB, BC, etc. weget the imperfect dome shown b
Byzantine and Romanesque architecture . 9. ^ Choisy, I/tsi. dArchit. I. 125. CH. Ill] DOMES AND VAULTS 39 A far more scientific and beautiful way was by the Thespherical pendentive, the discovery of which constitutes p^ndentivethe triumph of Byzantine architecture. It is arrived atin this manner. A BCD (Fig. lo) is the square and theinscribed circle E the dome to be placed over it. Imagine. Fig. lo. a larger dome FGHI circumscribed about the if the four segments ABG, BCH and the othertwo are cut off vertically on the lines AB, BC, etc. weget the imperfect dome shown by Fig. lo, No. 2. Thisis in fact the vault over the crossing of the cruciformmausoleum of Galla Placidia at Ravenna, and occurs in 40 DOMES AND VAULTS [ch. iii The many parts of S. Sophia. The great invention of the pendentive Byzantines was to slice off the top of this imperfect domeon a plane level with the crown of the four side arches(Fig. lo, No. 3), and from the circular ring thus formed tospring their dome. The four spherical triangles on whichthe dome rests,—relics of the imaginary dome FGHI,—are the pendentives, the strength of which lies in theirbeing arched in two directions both horizontally andvertically, and they are supported by being wedged inbetween the four arches of the square (Fig. 10, No. 4).Plate I shows such a dome in actual process of con-struction at the period when t
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Keywords: ., bookauthorjacksont, bookcentury1900, bookdecade1910, bookyear1913
