. Shield and compressed air tunneling . BACK ELEVATION FRONT ELEVATION Fig. 116.—The Pennsylvania Railroad East River Tunnel. New York (A-19)shield. (From Trans. Am. Soc. C. E., vol. 69.) double diaphragm, the arrangement for keeping a higher airpressure in front of the diaphragm, the closed muck chutes andman locks, the bead on the tail and the sliding shutters forloose gravel. The shield is shown in Fig. 116, which shows theshutters clearly. 63. Modifications of Shield.—On the East River work thegravel was so unlike that at Blackwall that after a good deal of •...-^:^^. SECTIO
. Shield and compressed air tunneling . BACK ELEVATION FRONT ELEVATION Fig. 116.—The Pennsylvania Railroad East River Tunnel. New York (A-19)shield. (From Trans. Am. Soc. C. E., vol. 69.) double diaphragm, the arrangement for keeping a higher airpressure in front of the diaphragm, the closed muck chutes andman locks, the bead on the tail and the sliding shutters forloose gravel. The shield is shown in Fig. 116, which shows theshutters clearly. 63. Modifications of Shield.—On the East River work thegravel was so unlike that at Blackwall that after a good deal of •...-^:^^. SECTION CC SHOWING BACK VIEW OF TRAVELING STAGE SE FiQ. .—Sh- Am. Soe C. E., vol. 68.) {Facing Page 270.) IIIMJillIMM - l I ll lllia ? ^-.^ L ? ij- .j, .-J^ -ig -~^ ?-? m- X ? ?-??» ? ?? ?.^, ???-?.. .-^^ ??iriiW V ILj ?,; ^ni^ ig^f
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Keywords: ., bookcentury1900, bookdecade1920, bookidshieldcompre, bookyear1922
