x12 inches, over the summits of these tunnels, at the usual distance consists of two polygonal frames of boards 9x3 inches, so apart. These shafts are lined with brick 16 inches thick, placed horizontally across the upper side of the horizontal tie arranged that the boards of one frame break joints… … NEW YORK-CENTERING OF THE GREAT ARCH, FOURTH AVENUE, NEAR 95th STREET Fig. 17.-THE UNDERGROUND RAILWAY IN rib), placed, one along the backs of the vertical shores, and pene-hammered granite coping 10 x 18 inches, surmounted by radius of curvature, which, for the intrados of the 68 feet two along…
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