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When by this arrangement of circuits the motor is brought to speed, the ground connection is broken between the motor or generator, or both, ground-switches P P' being employed for this purpose.

Assuming that the motor is a synchronizing motor or one that has the capability of running in synchronism with the generator, but not of starting, it may be started by the above-described apparatus by closing the ground connection from both generator and motor.

Make a thoroughly good ground connection with leaders, have all joints well soldered, and you may dispense with the rod as you propose.

If there is no spark in any of the plugs, this may be considered a positive indication that there is a broken main current lead from the battery, a defective ground connection, a loose battery terminal, or a broken connector.

It is necessary, therefore, to make a ground connection at each end of the line, the instruments being connected between the line wire and the earth.