Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 296
ly thincopper wire suspended at its upper end and dipping at its lowerend into a basin of mercury (Fig. 175). On passing a current,the successive turns of the spiral attract each other, draw thepoint out of the mercury, and break the contact; when thelower end of the spiral falls back again into… … Fig. 175. currents as edges of two magnetic shells which face each other.When the currents are in the same direction, the surfacesoppositely magnetized will be directly opposed, and thereforeattraction ensues. If the currents are in opposite directions, 2j& Electricity. [Book in. the surfaces…
Electricity
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from The Telegrapher [microform] (1864)](https://img.insideoutlibrary.com/img/200/ia-telegrapher04nati-65-32.webp)
