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… … •Strip Type lt|ieratiuy: Recorder. This strip type Bristol Electric Time Recorder is de-signed to record twenty different operations on one chart.The chart can be advanced at speeds varying from three-ourths of an inch per hour to twelve inches per minute. Bristol-Vurand Radii Averagriiig:…
Architecture · Building · Construction industry · Engineering
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