. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. t is a monumentof constructive art, someof the blocks being 9 feetsquare, and 2feet thick; thearch is composed of elevenvoiissoirs 16 feet dee|).For a detailed accountof its construction and or-nament the reader is re-ferred to the ArchitecturalAntiqultieg of Rome. The proportions are asquare, as is the openingof the archway, up to thespringing; and not a doublesquare, as described bySeiho. The pedestals arein height nearly half theopening of the ar
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. t is a monumentof constructive art, someof the blocks being 9 feetsquare, and 2feet thick; thearch is composed of elevenvoiissoirs 16 feet dee|).For a detailed accountof its construction and or-nament the reader is re-ferred to the ArchitecturalAntiqultieg of Rome. The proportions are asquare, as is the openingof the archway, up to thespringing; and not a doublesquare, as described bySeiho. The pedestals arein height nearly half theopening of the archway,which Palladlo ordinary proportionc;iven by the ancients. The entire length of the upper member of the cornice in thisexample is 48 feet, wiiich dimension corresponds with the entire height, almost to a fraction:the width of the opening is 1 7 feet 6 inches, a trifle more than one-third of the entire width :bounding the fat/adc by a parallelogram, excluding the attic, and drawing two diagonals,ire obtain the centre froia which the arch is struck, which rule will apply to the other Fig. 1051. AKCII OF ilEBGIUS AT Fie. iLO. AliCU OK TJIM. Al KOMJi. 3Q TRACTICE OF ARCHITECTURE. .,.,,.,.. f ..n rx ..v, ii^,^* v.»«^- Book III. 962 trhnnplml arches with a single opening, though varying materially from the principlesS!! down by Ialiphile, and adopted by Serlio and other architects at the navwal of Itahanarchitecture. Ihe Arch of Titus is a square com-prisiiij; its entire facade ;thatofPoliphile a squareup to the under side ofthe entablature; conse-quently, the opening ofthe triumphal way is inwidth half the heightto the top of the impostupon which the arciiivoltrests, while in the moreancient the entire aper-ture without the arch isa square. In the Arch of Poli-phile the entablature andpediments are nearlyequal in quantity to eachof the piers upon whichthey are carried ; and thepiers themselves are inwidth only one quarter ofthe whole breadth of thef
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