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 222
eric electricity on the con-ducting wire. The transmission of the battery cur-rent through the telegraphic wire, however long, ispractically instantaneous. Experiments which havebeen made on the velocity of electricity, appear toindicate that it is considerably greater than thatof light, which… … are firmly secured in a vertical position, the fourpoles appearing just above a small wooden table.The two armatures, A A, connected by a brass bar, 1.8 206 D A VI S S MANU A L. move upon a horizontal axis in such a manner thatwhile one is approaching the poles of the magnetover which it is placed,…
