Excerpt from General Lectures on Electrical Engineering
In the eight years since the earlier editions of "General Lectures on Electrical Engineering" appeared, material changes have taken place in the electrical industry. Electricity has made enormous forward strides, until it now seems destined to become the universal medium of the world's energy, through the agency of huge power generating systems. The small electric generating stations and the machinery used in them, arc rapidly disappearing before the substations of the unified power system.
The carbon-filament incandescent lamp, after holding sway for a quarter of a century, has become of mere historical interest, and the mazda lamp has taken not only the place of the carbon-filament incandescent lamp, but to a great extent of the arc lamp as well, so that the industrial importance of arc lighting has greatly decreased as compared with that of incandescent lighting.
As a result of these and many other developments, the preparation of the fifth edition required material changes and additions to the previous text. A large part of the book has been entirely rewritten, so that as it now stands it differs materially from the previous editions.
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