se for the construction pneumatic system for mail delivery and passenger the world, being engaged at the same time in solving of an underground railroad under Broadway had veen service had reached an acute stage, it was in this di- the same problem and arriving simultaneously at the granted by the… … WW ee OTM UES Sore eae “Wer S ut (4, hee so USE IN THE BLACKWALL TUNNEL, LONDON. Peter Barlow and Mr. J. H. Greathead. It is interest- and plans were at once made for the construction of a first conceived of the idea of the shield and the use of nine-foot tunnel under that thoroughfare. The neces-…
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