Contractors' and Dealers' Association of California · San Francisco : L. A. Larson · leaf 411
Secoruiiig Hiectilc xaeuuiueiei. This exhibit demonstrates the hand operation of a pneu-matic tachometer like that shown complete at top of page.The recording instrument is a low-range vacuum gauge.The motion of the revolving tube causes a partial vacuumthe degrpe of which determines the position…
Architecture · Building · Construction industry · Engineering
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![An illustration from [Catalog]. (1908)](https://img.insideoutlibrary.com/img/200/ia-catalog00macy-292-885.webp)
