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I fancied that the doctor struggled to demagnetize, so to speak, the look which she gave him. "You'll come to see me afterwards?" she asked, dropping the little package into her handbag of gold mesh and rattling the various accoutrements of beautification which tinkled next to it. Harris nodded. "You're a life saver to some " floated over to me from Marie.
The insulating strips in the commutator are sufficiently wide to demagnetize the whole of the machine before reversibility in the armature takes place, and this demagnetization sets up a direct induced current, which is caught in a shunt circuit by the aid of a second commutator, which only comes into action when the first commutator goes out.
Soft iron cores are not used in oscillation inductance coils and oscillation transformers for the reason that the frequency of the current is so high the iron would not have time to magnetize and demagnetize and so would not help along the mutual induction to any appreciable extent. High-Frequency Currents.
Large field-magnets are advantageous, and the tendency in the manufacture of dynamo machines has been to increase the mass of iron, because with long and heavy cores and pole pieces there is a steady magnetism insured, and therefore a steady current, since large masses of iron take a long time to magnetize and demagnetize; thus very slight irregularites in the speed of an armature are not so easily perceived.
Soft iron cores are not used in oscillation inductance coils and oscillation transformers for the reason that the frequency of the current is so high the iron would not have time to magnetize and demagnetize and so would not help along the mutual induction to any appreciable extent. High-Frequency Currents.
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