A manual of electricity, magnetism and meteorology (1844)
Lardner, Dionysius, 1793-1859, Walker, Charles Vincent, 1812-1882 · London Longman, Brown, Green & Longmans · leaf 509
ivot tothe plate M, and finally to the negative cup R. The ap-paratus being placed with its axis a? V at right anglesto the magnetic meridian, a little mercury is put on theplates M and N, to establish more effectually their con-tact with the pivots. The lozenge a z is formed oflight wood, and… … at length comes to rest in the plane of the magneticequator. (477.) The electro-magnetic helix is only a par-ticular example of a much more general arrangementimagined by M. Ampere, and denominated by hima Solenoid. Let a copper wire (fig. 238.) be wrapped with silk, sothat, when any two parts of…
Atmospheric electricity · Electricity -- Early works to 1850 · Magnetism
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