A manual of electricity, magnetism and meteorology (1844)
Lardner, Dionysius, 1793-1859, Walker, Charles Vincent, 1812-1882 · London Longman, Brown, Green & Longmans · leaf 493
of the helix, so as to rest on the lower parts ofthe wire. The moment theconnection is made with thebattery, the needle will startup and place itself in themiddle of the axis of thehelix, where it will remainsuspended in the air withoutany visible support. (459.) Mr. Watkins de-vised the… … CHAP. IV. INFLUENCE OF THE EARTH. 457 CHAP. IV. OF THE INFLUENCE OF TERRESTRIAL MAGNETISM ONELECTRIC CURRENTS. (460.) The mutual influence of magnets and electriccurrents, and the laws which govern it, being ascertained,it is natural to inquire what effect the globe of the earthitself produces upon…
Atmospheric electricity · Electricity -- Early works to 1850 · Magnetism
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-165-67.webp)
