id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
18722	Woodard, S. H.	Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The New York Tunnel Extension of the Pennsylvania Railroad. The East River Tunnels. Paper No. 1159			.txt	text/plain	27410	2078	86	shafts at the river front in Long Island City, four shields were driven method in Tunnel _B_, where compressed air, but no shield, was used, the shield was re-erected in Tunnel _A_ and was shoved through the soft the end of the work it was evident that the shields in Tunnels _B_, _C_, permanent cast-iron tunnel lining was erected as the shield advanced. iron tunnel lining and the rock. The shields in each pair of tunnels were advanced through the solid rock The first work in air pressure was to remove the shield plug closing the shield, blocked all work at the face of the heading while the former in Shield _D_ are shown in Fig. 3, Plate LXX, while the method of work The shields broke through rock surface in Tunnels _B_, _C_, and _D_, at of the top of the shield; in Tunnel _B_, the rock of the	./cache/18722.txt	./txt/18722.txt