A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 460
recipro-cating motion, the soft iron magnet with its coils of wire beingsuspended like the beam of a steam engine, on an axis, and fur-nished with projecting wires which dip into mercurial cups con-nected with a voltaic battery at each end of the apparatus. Thewires are so arranged as to change the… … 133. The north poles of the permanent magnets are both up-ward, and when the projecting wires at either end dip into thecup, the corresponding end of the soft iron becomes a south pole,and is repelled by the south pole of the magnet below it, whilethe elevated end being made a north pole is…
Physics
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