San Francisco : Architect and Engineer, Inc · leaf 24
ABOVE: As the mixer truck rolls down the line, freshlypoured lightweic|ht concrete is vibrated and surfaceevened-off preparatory to being tamped down andsmoothed by finishing crew. AT RIGHT: Finishing crew puts final touches onpre-tensioned, prestressed concrete panels whileanother 350 ft. casting… … JANUARY, 1957
Architecture · Building
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![An illustration from Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)](https://img.insideoutlibrary.com/img/200/ia-cu31924022817674-74-29.webp)
