. Dental electro-therapeutics. 90 ELECTRO-PHYSICS The current which is generated in the armature passesinto the external circuit and also induces a current in thecoil around the electro-magnet rendering it electro-magneticwhen the dynamo is in motion. There are two forms of dynamo winding, the serieswound and the shunt wound dynamo. In the series wound machine the current passes fromone brush through the field magnet coil, then throughthe external circuit back to the other brush. Fig. 29 Fig. 30.

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