Experimental engineering and manual for testing (1903)
Carpenter, Rolla C. (Rolla Clinton), 1852-1919 · New York, J. Wiley & sons; [etc., etc.] · leaf 525
the speed, so that the number of revolutions isread directly from the position of the needle on the graduateddial. The tachometer is arranged with a pointed end to holdagainst the shaft whose speed is to be determined, or with apulley so that it may be driven by a belt. §415-] METHODS CF TESTING… … FlG. 219.—SCHAEFFER AND BUDENBERG HaND TaCHOMETER. vattbs mercury in the revolving arms and depresses it in thecentre tube. A calibrated scale gives the number of revolu-tions corresponding to a given depression. 415. The Chronograph.—The chronograph,* Fig. 220, con-sists of a drum revolved by…
Building materials · Machinery
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