ecting pieces of one half the commutator, while don, England. the other is always in connection with the other half. Hence one transmits the positive and the other the negative currents. DUEBER’S IMPROVED WATCH CASE. When the machine is set in motion, a current is produced The obvious advantage of… … prevents the currents heing changed during periods of rest, __ Ww no necessity for carrying a separate key. But many consider so that no preliminary examination of the currents is neces- that the annoyance of lost or mislaid keys is of less impor- ary before at once setting the apparatus in…
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