section of point the wall rises 8 feet and 6 inches to the springing at Fig. 13, which represents the tunnels and ventilator, where the tunnel through one of the ventilators. Those of the line of the arch, vertical in the inner face but battered on the the thickness is indicated by the dotted lines… … UNDERGROUND RAILWAY IN NEW YORE-CROSS SECTIONS OF THE MASONRY TUNNELS AND VENTILATING SHAFTS. Fig. 18.-THE ' 1874 SCIENTIFIC AMERICAN, INC.
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