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Define the intrados and extrados of an arch.— Scientific American Supplement, No. 561, October 2, 1886
Norman arches resemble the doorways in having sub-arches recessed within an outer arch, the intrados often being decorated with mouldings such as the zigzag or the lozenge.— English Villages
The reinforcement consists of arch and transverse bars; the arch bars are spaced 6 ins. on centers 2½ ins. from both extrados and intrados, and the transverse bars are spaced 24 ins. on centers inside both lines of arch bars.— Concrete Construction Methods and Costs
The four sides of the mold formed the extrados, the intrados, and the two ends of the block; the other two sides being left open.— Concrete Construction Methods and Costs
One layer of felt with 4 "overlap to be nailed to lagging of inch boards, using tin washers on nails over the whole of the intrados of the arch before starting any concrete or placing any of the permanent felt and pitch water-proofing.— Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The Bergen Hill Tunnels. Paper No. 1154

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