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 191
entre of themagnetized bar within the circle. The action of allthe circles of which the helix is composed, drawsthe bar into it until its middle lies within the mid-dle of the helix, in which position only can the forcesneutralize each other. The terms axial force andaxial motion are used to… … AXIAL REVOLVING BAR. 175 that of the coil. This motion is communicated to a hammer, which strikes a bell. A wire, fixed to the iron rod below,jFYff. 114. rests on a sprmg near B. When the rod islifted by the currentin the coil, C, itsupper end raises thehandle of the ham-mer, A guiding wire,R,…
