Vintage 1910s-1920s Westinghouse Electric Instruction Book Lot of 27 Pittsburgh

Vintage 1910s-1920s Westinghouse Electric Instruction Book Lot of 27 East Pittsburgh  Rare bulk lot of 27 original Westinghouse Electric & Manufacturing Company instruction booklets, printed roughly 1913-1921 out of their East Pittsburgh, PA works (with a few from the Newark and Shadyside works). Red card-stock covers, black text, three-hole punched, standard 8.5x11 pamphlet format typical of Westinghouse's early industrial documentation.  Titles included cover a wide range of early electrical and industrial equipment: Synchronous Converters, Motor Generators and Frequency Changers, Arc Welding Equipment, Air Blast Transformers, Rotary Converters and Synchronous Booster Rotary Converters, Type C Direct-Current Control, Steel Mill Type DC Motors and Brakes, Type CR Reverse Power Relay, Oil-Insulated Transformers, Steam Turbines, Type HL Unit Switch Control Equipment, Type U Graphic Meter, Mill-Type DC Motors, Type RO Watthour Demand Meter (multiple copies), Liquid Slip Regulators, Type F Magnetic Controllers, Westinghouse-Leblanc Jet Condensers, Underfeed Stokers, Automobile Ignition and Lighting System, and Industrial-Type Turbine.  Great find for engineers, electrical/industrial history collectors, museum or archival collections, or anyone restoring/researching early 20th-century power equipment. A few duplicate titles are included in the lot (see photos for full breakdown).