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When printed, the little plates emboss themselves more deeply into the paper than the ground plate, giving a perspective effect.

The ground plate here is one of the electrodes, and the other is replaced by the surface of the earth strongly charged to a great distance under the storm clouds.

No notable modification occurs, then, in the curves of equal potential, in the vicinity of the ground plate through the action of this extended charge, nor consequently any modification in the curves of the current; but the electricity which spreads has but a short distance to travel in order to overcome the most important resistances.

The carbon blocks with their separator slide between clips and a ground plate.

In this the pin in the heat coil projects unequally from the ends of the coil, and under the action of a sneak current the melting of the solder which holds it allows the outer spring to push the pin through the coil until it presses the line spring against Page 311 the ground plate and at the same time opens the path to the switchboard.