of the ground, dinal 12 inch girders and bound to them by half, in bolts described retaining walls,seven feet thick at railroad grade, where the construction of what are known as the beam tun- passing through the flanges, as shown in Figs. 10,11, rest the and sloping off thence with a batter, on… … TO. 7.—THE UNDERGROUND RAILWAY IN NEW YORK CITY.—CROSS SECTIONAL ELEVATION OF THE BEAM TUNNELS AND VENTILATORS 59th TO T6th STREETS ' 1874 SCIENTIFIC AMERICAN, INC.
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