Practical electricity .. with questions and answers (1911)
Cleveland armature works, [from old catalog] comp, Lincoln, John C. [from old catalog] · [Cleveland, Ohio, Cleveland armature works] · leaf 52
lines of force fromthe earth are flowing in theair from the south to thenorth. Near the equator themagnetic force acting on ahorizontal compass needle isgreater than in other partsof the earth. The earth as a magnet acts on a horizontal compass inthe United States with a force corresponding to from… … Figure 13Bar magnet and field of force. 42 the lines of force. A picture of the mag-netic lines producedin this way is called a magnetic spectrum. A bar magrnet bent iniio a TT shape is called a horse-shoemagnet, and it is interesting -to get the magnetic spectrumof such a magnet. (See Fig. 20.)…
Electricity
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