Baille, Jean Baptiste Alexandre, b. 1841, Armstrong, John W., ed · New York, Scribner, Armstrong, and co. · leaf 73
earth as far aspossible, there is joined to this needle a second oneas like the first as possible, in form and degree ofmagnetization.* * These needles are arranged so as to hang one exactly abovethe other, parallel to it, and with its poles in the opposite direc- 5 J: WONDERS OF ELECTRICITY. Of… … Ordinary Compass. bin, are wound many coils of a copper wire, coveredwith silk, so that each turn of the wire is isolatedfrom the neighboring turns.* tions. To secure this relative position, the two needles are firmlyattached by their centres to a brass rod \ or % of an inch inlength. They are thus…
Electricity
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