Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity (1854)
Davis, Daniel · Boston : Palmer and Hall · leaf 177
ction of the arrow. A smalliron rod, or short piece of iron wire, placed verticallyin front of the horizontal portion of the copper wire,becomes instantly a magnet, with its north polebelow the wire. The direction of the induced po-larity is reversed by transferring the iron rod to theother side of… … wire, keeping it transverse, it will be seen that theinduced poles retain their relative position with re-gard to the current. As the rod is carried round,the end which was a north pole in the positionshown in the cut, remains north in every part of therevolution. The rod attracts iron filings, and…
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-713-416.webp)
