. Shield and compressed air tunneling . \ G-4-Elbe,Hamburg Highway -n- Rotherhithe,HighwoL|London R Seine mgrr, 5^^ ^?^e-ib-ElmTunnel F-E-Siphon De La Concorde, Railway P°^^5ewer Sco\es •Abod 0 10 20 30 40 SOFecf- eConcreh .li-l 1 I ^^^^ ?BauofHavdna 0 100 200 300 400 SOOFeet ^ I I I I ? I ? K^>^:^^ C-l-Havana Sewer 0 1000 2000 4000 5D00 Feet kys. (Facing Page 66.) ^f^? ?ri>;*^

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Keywords: ., bookcentury1900, bookdecade1920, bookidshieldcompre, bookyear1922