San Francisco : Architect and Engineer, Inc · leaf 580
yof the problems encountered were both newand in some instances unique. grade provided sufficient headroom a tran-sition was made to a circular section, withthe roadway in the center and a large airduct below and above. Except for requir-ing very deep and wide cuts with heavyearth pressures to… … OPERATORS INDICATOR BOARD, GEO. A. POSEV TUBE Showing Status of All Signals, Fans and Motors Of the covered length, 1042 lineal feetor 44 per cent, was constructed in a deepopen trench and cofferdam in the dry, andthe balance was constructed by precastingtwelve immense concrete tube segments ina…
Architecture · Building
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