The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 630
Fig. 387. Voltmeter Switch. … Tachometer. An instrument which, by a pointer on a dial, indi-cates at any moment the revolutions per minute of a revolving body. It comprises a small governor whoseshaft is rotated by the revolving body.The centrifugal force of the governorweights is resisted by a helical spring.The deflection of…
Electricity
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