Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 363
Direction of current in the coil at one-half revolution from the position in Fig. 316. Brush M is positive as before. … Fig. 318.—Magneto Dynamo. DYNAMO ELECTRIC MACHINES. 345
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Catalogue] (1908)](https://img.insideoutlibrary.com/img/200/ia-catalogue00demo-84-178.webp)
