th end, 165 feet further north. The springing lines of the arch are 12 The roofs of the tunnels are semi-circular arches: that of feet above railroad grade, and start from the solid ledge wher- ever possible. Throughout its entire length, it is lined up to springing line with rubble masonry 5 feet… … NEAR 95th STREET. tunneling; from this latter point to 92d streef extends a sec- general character the same 48'those already described, but The thickness of the atch varies of tH8‘spritying Tne and tion of brick tunneling, 8,2874 @litlp length ; from 92d street only 6 feet in diameter in the clear,…
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