Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book
An elementary electricity textbook by Coates Walton Swoope, published by D. Van Nostrand in New York in 1902 for students and self-taught tradesmen learning principles, experiments, and calculation. The line diagrams show dynamo field magnets marked S and N, wound coils, commutators, lamp circuits and arrowed current paths, giving designers stark schematic linework, hand-lettered labels and repeating coil spirals.
