This early work on electrical machinery is both expensive and hard to find in its first edition. It contains details on the design and specification of direct and alternating current machinery. This is a fascinating work and is thoroughly recommended for anyone with an interest in electrical engineering. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.