Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 754
nic are rci-ular, niul arc either secular, annual, or 734 On Magnetism [728- diurnal ; others, which arc irregular, are due to what are called magneticstorms (738). Secular variations.—In the same place the declination varies in thecourse of time and the needle appears to make oscillations to the… … This table shows that since 1580 the declination has varied at London asmuch as 36°, and that the greatest westerly declination was attained in 1800,since which time the north end of the needle has gradually tended towardsthe east. At Paris the changes have been similar to those at London. In 1580…
Physics
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