Channing, William F.(William Francis),1820-1901 · Boston : Thomas Hall · leaf 288
rs or cords, is done by aswitch on the base of the instrument. When the switch ison the knob of brass marked S, you get the secondary cur-rent, (which is very powerful;) when on the knob markedP, the positive current is in connection. The different cur-rents are changed in our instrument by merely… … Pig. 60.
Electrotherapy · Medicine, Physical · Electricity
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