San Francisco : Architect and Engineer, Inc · leaf 84
on Architecture andRelated Subjects and Problems is by the San Fran-cisco Museum of Art and the Northern CaliforniaChapter of the American Institute of Architects. The December issue of the Washington StateChapter did not carry on with the November issuesitem, Favorite Stories Modernized, which is… … In this laboratory, all UTILITYfan and blower designs are tested...todetermine the intensity and frequency ofsound waves produced. This ingeniousequipment shows both the volume andpitch of sound at varying speeds... so thatair coolers, forced air furnaces and fans canbe operated with minimum noise.…
Architecture · Building
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![An illustration from [Catalog]. (1908)](https://img.insideoutlibrary.com/img/200/ia-catalog00macy-292-885.webp)
