Containing Parts I and II: Constant Current and Alternate Current Apparatus, this manual on electrical machines and the science behind them is a quintessential manual on how electricity was used in the late 19th century. Well described and laid out in plain language, this is an essential historical textbook on electricity and its use. Plenty of useful diagrams and descriptions of electrical equipment recognized before becoming more ubiquitous in the 20th century. Printed by J.H. Yewdale & Sons Co. of Milwaukee, Wisconsin for Frederick Keppy Scientific Book Publishers of Bridgeport, Connecticut. This omnibus volume has an intact binding with heavy wear on the cover, and staining and marks on interior.