The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 228
if it was placed under, thesame pole moved to the east. If the connecting wire was placed parallel withthe needle, that is, brought into the same horizontal plane in which the needlewas moving, then no motion of the needle in that plane took place, but atendency was exhibited in it, to move in a… … Fig. 3. a convenient arrangement for exhibiting the action of a wire conducting acurrent of Electricity on the magnetic needle, a a, two turned wooden pil-lars screwed into a base board B, and surmounted by two mercury cups c c.n, a copper wire, the ends of which dip into the mercury, as do also…
Architecture · Civil engineering · Science
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