TransactionsPublished under the care of the General Secretary and the Treasurer . RENT. to fix the scale of the curves directly on the oscillogiams, afterthe record of the curves of current and voltage, the two rings S^and S2 were connected by closing the switch AS. The currentthrough the brush then became constant and a horizontal linewas obtained on the oscillogram. In order to get the voltagescale, the commutator at rest was so placed that the circuit wasbroken; the horizontal line, which was obtained in the oscillogramfor this case, corresponds, consequently, to the 10-volt pressureof the
TransactionsPublished under the care of the General Secretary and the Treasurer . RENT. to fix the scale of the curves directly on the oscillogiams, afterthe record of the curves of current and voltage, the two rings S^and S2 were connected by closing the switch AS. The currentthrough the brush then became constant and a horizontal linewas obtained on the oscillogram. In order to get the voltagescale, the commutator at rest was so placed that the circuit wasbroken; the horizontal line, which was obtained in the oscillogramfor this case, corresponds, consequently, to the 10-volt pressureof the storage batter3^ With this arrangement, which correspondsto the case observed above, A e = constant, experiments were per-formed with different velocities of the commutator with resistancesRjj self-induction S and different carbon brushes. In the follow-ing only the characteristic ones will be given: The oscillograms, Figs. 31 to 35, were all recorded with softcarbon brushes. Brand X, of the firm Carbone. The totallength of the 3 brushes was B = cm, and their width in sur-. Fig. :J1a.
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Keywords: ., bookcentury1900, bookdecade1900, bookidtr, booksubjectelectricity
