In his own words, Bell realized that: when a permanent magnet is moved towards the pole of an electromagnet, a current of electricity appeared in the coil of the electro-magnet;
(Bell; realized; that; T:when a permanent magnet is moved towards the pole of an electromagnet) (a permanent magnet; is moved; towards the pole of an electromagnet) (a current of electricity; appeared; L:in the coil of the electro-magnet)
Bell a permanent magnet a current of electricity
realized is moved appeared
that T:when a permanent magnet is moved towards the pole of an electromagnet
towards the pole of an electromagnet
L:in the coil of the electro-magnet