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Scientific American, Vol. 31, No. 22 (1874) (1874)
leaf 3
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 consiraction 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… … FIG. 7—THE UNDERGROUND RAILWAY © 1874 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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