San Francisco : Architect and Engineer, Inc · leaf 121
the earththrough the dredging wells. Once landed on rock, sufficient concreteis poured in the wells to bond the pour tothe rock, thus producing a cellular con-crete structure of unusual strength andlightness, taking into consideration thearea of its base. In the East Bay two false bottom flota-tion… … bottom and the caisson sinks through thesoil by the process of dredging out theearth beneath it through the dredging wells. These caissons have not the steel cylin-ders of the compressed air caissons butotherwise operate on the same principle. Sheet piling cofferdams are in construc-tion alongside…
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![An illustration from International match. Complete record of the [checker] games played between players of Great Britain and the United States, Boston, March 14th to 25th, 1905 (1906)](https://img.insideoutlibrary.com/img/200/ia-internationalmat00heff-18-3.webp)
