Researches on diamagnetism and magne-crystallic action : including the question of diamagnetic polarity (1870)
Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 162
WSM J,, ■ MIL III :n D ^*e ^ i^. ^ ,/;•,/ <# … Fiq 43 ACTION OF ELECTRO-MAGNET ON ELECTRO-DIAMAGNET. 131 proceeded to the current reverser K., and thence to a secondbattery of considerably less power than the former. By meansof the reverser B/ the polarity of the cores could be changed;P could be converted from a south pole to a north pole, at…