of electrical science in a popular and interesting way, as befits
the scheme of the series to which it belongs. Electrical phenomena
have been observed since the first man viewed one of the most
spectacular and magnificent of them all in the thunderstorm, but
the services of electricity which we enjoy are the product solely
of scientific achievement in the nineteenth century. It is to
these services that the main part of the following discussion is
devoted. The introductory chapters deal with various sources of
electrical energy, in friction, chemical action, heat and
magnetism. The rest of the book describes the applications of
electricity in electroplating, communication by telegraph,
telephone, and wireless telegraphy, the production of light and
heat, the transmission of power, transportation over rails and in
vehicles, and the multitude of other uses.

July, 1915.





PUBLISHERS' NOTE.


For our edition of this work the terminology has been altered to
conform with American usage, some new matter has been added, and a
few of the cuts have been changed and some new ones introduced, in
order to adapt the book fully to the practical requirements of
American readers.