12 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 horizou:tal tie arranged that the boards of one framebreak joints… … ‘pene-hammered granite coping 10 x 18 inches, surmounted by rib), placed, one along the backs of the vertical shores, and radius of curvature, which, for the intrados of the 68 feet ‘an iron railing. During the excavation of the tunnel, these two along the backs of the inclined shores. On the…
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