Rheostat
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“The rheostat is an apparatus for admitting the current to the motor gradually, so as not to heat and injure the coils and insulating material by admitting the full current before the armature has attained its full rotary speed...” -Atkinson 1903
Source
Atkinson, Philip Electricity for Everybody; Its Nature and Uses Explained (: The Century Company, 1903) 148
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