Chicago : Engineering and Contracting Pub. Co. · leaf 21
e of the water and the watermust be exposed for a certain length oftunc (at S ins. distance the exposure is 4seconds), so that the velocity of the waterwould necessarily be slow or a large num-ber of ultra violet rays would be used. Thecom of the method as compared to slowsand filtration at $10.40… … July 5, 1911. ENGINEERING & CONTRACTING 7 EARTH AND ROCK SECTION Standard Plans and Specifications for Grading, Seattle, Wash. The city of Seattle, Wash., through its CityEngineer, Mr. R. H. Thomson, and its Boardof Public Works, has formulated completestandard plans and specifications for the…
Buildings
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