Originally published in 1890, this early work on Principles of Dynamo-Electric Machines is both expensive and hard to find in its first edition. It is a comprehensive and informative look at the subject, with much of the information still useful and practical today. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.