. Dental electro-therapeutics. sts of a number of copper bars insulated fromeach other and mounted in the form of a cylinder throughwhich the insulated shaft passes, the number of bars cor-respond to the number of coils in the armature to whichthey are also attached. The Collective/ Brushes consist of two copper gauze brushesor carbon blocks which are in contact with the commutator,set opposite one another on the commutator; when thedynamo is in motion the segments of the commutator pass in DYNAMO CURRENTS 87 rapid succession under the brushes which collect the currentgenerated in the machine
. Dental electro-therapeutics. sts of a number of copper bars insulated fromeach other and mounted in the form of a cylinder throughwhich the insulated shaft passes, the number of bars cor-respond to the number of coils in the armature to whichthey are also attached. The Collective/ Brushes consist of two copper gauze brushesor carbon blocks which are in contact with the commutator,set opposite one another on the commutator; when thedynamo is in motion the segments of the commutator pass in DYNAMO CURRENTS 87 rapid succession under the brushes which collect the currentgenerated in the machine and conduct it from the dynamoby wire connections attached to the brushes. The com-mutator converts the alternating current set up by the actionof rotating the insulated conductor in the magnetic fieldinto a continuous current. 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
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