Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book
An elementary electricity textbook by C. Walton Swoope, published by D. Van Nostrand in New York in 1909 for students and self-taught tradesmen. The line drawings diagram magnets, armatures, commutators and closed circuits, with lettered poles and arrowheads marking current direction — useful for schematic arrow conventions, hatched pole pieces, and coil and winding motifs.
