Chapter XII: Our Heaviest Duties

_THE SCRIBE'S NOTE ON CHAPTER TWELVE_

Here the electron explains its behaviour in a dynamo at work.

The principle of the dynamo was discovered by Faraday in the
thirties of last century.

He found that when a coil of wire was moved through a magnetic
field, there was a current of electricity induced in the moving
coil.

Experimental machines were constructed, and after a while a
practical dynamo was evolved.

Wires are attached to a dynamo and the electric current is led
out.

This current may be conducted to a distant tramway car, and, by
sending the current through an electric motor, mechanical motion
is produced and the car propelled along.

An electric motor is practically the same as a dynamo, but
instead of turning its coil round in order to produce an
electric current, we pass a current into the coil and it moves
round. It will be sufficient to leave the electron to tell its
own story.