Elementary treatise on electricity and magnetism (1903)
Foster, George Carey, 1835-1919, Joubert, Jules François, 1834-1910. Traité élémentaire d'électricité, Porter, Alfred William, 1863- joint author · London, New York, Longmans, Green, and co. · leaf 339
the north pole,the period of a complete rotation beingabout 900 years (Fig. 207). Thus atParis, which is represented in thefigure by p, the declination, which waseasterly when first recorded, was zeroin 1666 ; since this time it has beenwesterly, and went on increasing until1824, when it amounted… … 247] SECULAK CHANGES 317 has diminished steadily from 1666, and, on the same hypothesis,wUl continue to do so until about 2114. The values of the declination near London at different times areshown in Fig. 208, while in Fig. 209 are shown the lines of equal zoVJ ^ --..^ .o- / N I500 iboo / r leoo…
Electricity · Magnetism
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