Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 363
brushes so that & &* EXP* d7an)eUoCony °PWitefP0int8 0f the°^J?SL!SSu^ ^ to^^rf^S^t8^ 8l°Wly the needle i8 ~w deflected (b) Reverse the directionof rotation, and the directionof deflection (or polarity ofthe brushes) is now reversed. (c) Increase the speedand the deflection increases.Why?… … 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)
