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Show . Engineering Feat in Building San Diego Dam J iwnin 'iji, I i ii i.iiijiiii "7 1 1) ii j j u 1 1 1 l j ii 1 1 .hi ;i f -ir -it-.hi if ' 1 i ' tw-"w-" wumvfw cHirj :tA-h:M The unprecedented engineering feat of constructing an Impounding dan. in the face of rising water Is here shown. ecimDHBZrHydSic Engineer I . N, Savage In the building of the Barrett dam for the city of San Diego, Cal. CoffSms . came Into the waters rose above leve.s .on which derricks were working, carrying concrete lha derrick woSS TlVused to build up on each side of them; then be lifted from the holes to fill them up and u d SeJ Iri t llfteJgaht In the foreground of this photograph is seen one of these spaces, at the abutment, protected by a cofferdam and far below the level of the water. |