. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. ofe<iual breadth, and thus affording betterbond to the bricks, 1903/. The Metropolitan Building Act,1855, requires that tnider a public way,an arch, if it be employed, of a span of notmore than 10 feet, is to be at least inchesthick ; when not exceeding 1,5 feet, it mustbe 13 inches at least; and beyond thatwidth the thickness requires special appro-bation. If of iron construction or other incombustible material, it must be built in a manner
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. ofe<iual breadth, and thus affording betterbond to the bricks, 1903/. The Metropolitan Building Act,1855, requires that tnider a public way,an arch, if it be employed, of a span of notmore than 10 feet, is to be at least inchesthick ; when not exceeding 1,5 feet, it mustbe 13 inches at least; and beyond thatwidth the thickness requires special appro-bation. If of iron construction or other incombustible material, it must be built in a manner approved by the district surveyor. An aich over a jjublic way must be formed in tlieabove manner, but a span not exceeding 9 feet must he Scinches thick at least. A likespecial approval is required if the arch or floor be of C17/t-. riREPROOF ARCHES, FLOORS, AND ROOFS. 19035. Light arched flat floors, composed of bricks cemented with gypsum or plaster,have been in common use in Roussillon from time immemorial. Rondelet is of opinionthat the segment of a circle is a better form for such arches than the low semi-ellipse. Hedescribes apartments of 18 feet by 25 feet, as used at the War Office at Versailles, coveredwith brick arches of which the rise was only ^,th part of the span and in five coach-houses and stabbs of the Marshal de Belle Isle at Bisy near Vernon, werearched in an elliptical form, having a rise of i th of their span, which was 32 feet 9| were not finished until a year after the walls and roof had been completed. Thewalls were built of rubble-work having chains of cut stone at intervals of about 16 were 2 feet 8^ inches thick, being about equal to-,2 f P^* «f ^l^ span. Thesearches were formed of a double thickness of bricks laid flat, and in plaster, built
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