Experimental engineering and manual for testing. For engineers and for students in engineering laboratories (1906)
Carpenter, Rolla C. (Rolla Clinton), 1852-1919 · New York, J. Wiley & Sons; [etc., etc.] · leaf 604
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. §4I5-] METHODS OF TESTING… … FlG. 275.— ICHAEFFER AND BUDEXBERG HAND TACHOMETER. vat£s 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. 276, con-sists of a drum revolved by…
Building materials · Machinery
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