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Published online by Cambridge University Press: 17 January 2013
I have already endeavoured to prove that Auroræ and Earth-currents, far from producing magnetic disturbances by their direct action, are themselves only secondary or induced currents, generated by those small but abrupt changes of the earth's magnetism which constitute such disturbances. The proof of this statement was in the first place derived in a general manner from the fact that during the notable magnetic storm of August and September 1859, all the elements of the earth's magnetism at Kew remained for many hours on one side of their normal positions, while, on the other hand, the earth-currents observed during that time by Mr C. V. Walker had their direction reversed every two or three minutes.
page 355 note * Phil. Trans. for 1861, p. 423.
page 355 note † Ibid. for 1862, p. 621.
page 355 note ‡ Ibid. for 1862, p. 203.
page 357 note * Dover—London, u, means that a stream of positive electricity is travelling (to use railway language) up from Dover to London, and a similar rule applies to the other headings.
page 360 note * The declination needle was on this occasion considerably to the west of its normal position.
page 362 note * The declination needle was on this occasion considerably to the east of its normal position.
page 364 note * The declination needle was on this occasion considerably to the west of its normal position.
page 364 note † The declination needle was on this occasion considerably to the east of its normal position.
page 365 note * The declination needle was on this occasion considerably to the west of its normal position.
page 365 note † The declination needle was on this occasion considerably to the east of its normal position.
page 366 note * The declination needle was on this occasion considerably to the west of its normal position.
page 366 note † The declination needle was on this occasion considerably to the east of its normal position.
page 368 note * Vol. xxiv. p. 115.