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This vintage softcover booklet provides a foundational overview of electrical theory and concepts as understood in the early 20th century. Part of the iconic Ten Cent Pocket Series, it serves as an educational resource for students and hobbyists interested in the history of science. • Title: Principles of Electricity • Author: Norman R. Campbell, M.A., Sc.D. • Publisher: Haldeman-Julius Company • Series: Ten Cent Pocket Series No. 133 • Era: Circa 1920-1930s "Little Blue Book" • Condition: VG- Item will be securely packaged and shipped quickly to ensure safe arrival. Keywords: vintage science, physics history, antique pamphlet, educational ephemera, kansas publishing, collectible booklets, stem heritage, early 1900s, technical literature, pocket guide Check out all of our similar items!