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 282
direc- JyiSm 1/1. tion wiii occur, andin the same direc-tion as that obtainedby parsing it overthe other pole. Theheliacal ring may beconnected with adelicate galvanome-ter, such as is de-scribed m ■% 162,with the same re-sult. 428. \^ the he-lix represented in Fig. 107 is connected with… … magnet is at rest within the coil. On drawing th^e magnet oi3?t, the needfe is deflected in the oppasitedirection. By moving the magnet in and out so asto keep time with the oscillations of the needle, theyare greatly increased. Reversing the direction ofthe mmgnet, so as to make it enter by the…
