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The enlargement of these ideas will be found in Mr. Tesla's work on the pyromagnetic generator, treated in this chapter.

Pyromagnetic, pī-rō-mag-net′ik, adj. pertaining to magnetism as modified by the action of heat.

In Edison's pyromagnetic dynamo it will be remembered that it is necessary to provide some small amount of motive power from an extraneous source in order to revolve the shield by which the heat is alternately directed on one half or the other of the armature cores.

Several years ago, experimenting in this field, Edison devised and operated some ingenious pyromagnetic motors and generators, based, as the name implies, on the direct application of heat to the machines.

The pyromagnetic generator is based on the same phenomenon; its aim being of course to generate electrical energy directly from the heat of the combustible.