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This is what happens in the Edison compound-wound dynamo.

Edison was the first to use in practical work the compound-wound dynamo, and this was done in connection with his electric railway.

Sometimes they are compound-wound, but compounding is less important in telephone generators than in some other uses.

But the bullet had been unable to elude the compound-wound magnets, each of which now had quite four times the designed voltage impressed upon its coils.

The dynamo is a modern four-pole machine, compound-wound, with a rated output of 46 amperes, at 125 volts—in other words a dynamo of 5.75 kilowatts capacity, or 7.7 electrical horsepower.