- tirely feasible. hattan Island. The prelimi- The city of n a r y sound- London can al- ings, borings so boast of .eev and other sur- eral tunnels be- Fig. 4.—EHTBANCE TO TUNNEL ON THE SOUTHEBN OB KENT SIDE. MlDDLESEX. COMPRCSSED t COMP* AtP I CUT » coven I cOMPPta«lD Am OPBM APPnOACH i t- sa… … Pig. 6.—IHTEBIOB VIEW OF BLACKWALL TUNNEL, BENEATH THE TAAMES, SHOWING CAST iBON LINING COMFLETED.
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