Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 188
is shown in Fig. 58. It consisted of a brasscylinder upon which a spiral groove was cut, mounted upona screw-threaded axis, and capable of being made to rotate,and at the same time move onwards in the direction of itslength, by means of a handle. A heavy fly-wheel attachedto the end of the shaft… … Fig- 58- diaphragm stretched underneath a mouthpiece, as shown inthe illustration. When the mouthpiece was spoken into, thediaphragm was set in vibration, causing the latter to vibrateup and down against the tin-foil just above the helicalgroove-cut in the cylinder, and make a series of…
Electric industries · Electricity
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