, both points may be in value than described, but the sum total actual contact with the lever, so that the of all remains the same. The lever of B latter shall not move at all; but the in practice is in constant vibration be- local circuit shall be changed by the tween its contact points, and the… … Fig. 83. System of Regulation. arranged, variations in the strength of circle, in addition to its positive move- ments over a greater or less number of the lighting current, sensible only to a galvanometer, may be made to operate studs. the circuit of a local battery, and thus In the engraving…
Engineering
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten15unit-809-430.webp)
