East Boston: a survey and a comprehensive plan . ion between the two districts nowserved by the ferries, a tunnel with outlets at the marginalstreets at each end would serve much better than a bridgeon a high grade. The cost of one or more tunnels largeenough to meet all present requirements would be muchless than the cost of a high bridge. The annual cost of theupkeep of a tunnel would be much less than that of abridge. The exposure to rough weather on a bridge isnecessarily objectionable, while the tunnel would be at alltimes protected. The objections to a tunnel on account of Development of
East Boston: a survey and a comprehensive plan . ion between the two districts nowserved by the ferries, a tunnel with outlets at the marginalstreets at each end would serve much better than a bridgeon a high grade. The cost of one or more tunnels largeenough to meet all present requirements would be muchless than the cost of a high bridge. The annual cost of theupkeep of a tunnel would be much less than that of abridge. The exposure to rough weather on a bridge isnecessarily objectionable, while the tunnel would be at alltimes protected. The objections to a tunnel on account of Development of East Boston. 95 light, air and sanitation have been successfully met inEngland and can be met here, and even if a high bridgeseemed more desirable the expenditures already made inthe rapid transit tunnel have reduced the value of a bridgeby at least the cost of that tunnel. As a practical scheme there is every reason to believe thata tunnel can be satisfactorily built. The work of con-struction would not be materially different from that which. CI7Y PZ-JUWOfG BOJ1KBSLAST BOSTO*/l>Jiej>YJLE:JTEAMING TIM/EL (^SUBWAZEXTENSION! Ti BRS i£ PROFILES FOR A TEAMING TUNNEL, AND FOR SUBWAY EXTENSIONS. was done in the existing rapid transit tunnel. The questionof maintenance would not be materially different from thatnow successfully carried out in teaming tunnels in question of approaches can be met in either of twoways, or preferably both, by incline entrances and by ele-vators as shown on sketches herewith (Figs. 30 and 31). A thorough study of bridges and sub-aqueous tunnelshas recently been made by Messrs. Jacobs and Davis ofNew York, consulting engineers, as reported upon by themto both the New Jersey and New York Interstate Bridge 96 City Planning Board. and Tunnel Commissions, and also presented in a paper byGeorge D. Snyder, published in the proceedings of theAmerican Society of Civil Engineers, Vol. XL., No. 5, May,1914, pages 1323-1376. In these reports
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectschools, bookyear1915
