econd. To prevent a pro- which bears continually on the sleeve, a. The regulat- utility of the phonograph as a scientific instrument longed sound from the bell, it is damped by stretching ing device, H, consists of a curved spring supporting was to a great extent due to the perfection of the over… … Fig. 2.—PHONOGRAPH GOVERNOR. Fig. 1—PHONOGRAPH MOTOR. this character it is a matter of little consequence whether the battery used Among the different motors applied to the phono- is constant, provided it has a surplus of power. To similar way, by means of audible signals, the activity utilize the…
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