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Published online by Cambridge University Press: 06 July 2012
1. Relation to Magnetic Survey.—After being engaged for sometime, in conjunction with Professor Thorpe, upon the Magnetic Survey of the United Kingdom, Professor A. W. Rücker, F.R.S., put forward his theory of Terrestrial Magnetism.
In connection with this theory, it was desirable to determine the permeabilities of various rocks, both at ordinary and at high temperatures.
2. The investigation which forms the subject of the present paper is an instalment in this direction. Professor Rücker proposed this undertaking and indicated the plan to be followed. It was then carried out under his supervision at the Royal College of Science, London.
page 567 note * “Relation between Magnetic Permeability of Rocks and Regional Disturbances,” Rücker, , Proc. Roy. Soc., vol. xlviii., June 19, 1890Google Scholar.
page 568 note * The arrangement adopted for obtaining the sulphur vapour and the temperature assigned to it were those given by Messrs Callander and Griffiths (Proc. Roy. Soc., vol. xlix. No. 296, page 56, Dec. 18, 1890Google Scholar) in the paper “On a Determination of the Boiling Point of Sulphur and a Method of Standardising Platinum Resistance Thermometers by reference to it.”
page 572 note * Magnetic Induction in Iron and other Metals, by J. A. Ewing, F.R.S., pp. 24, 25.
page 574 note * Magnetic Induction in Iron and other Metals, by J. A. Ewing, F.R.S., pp. 24, 25.
page 575 note * Ewing's, Magnetic Induction in Iron and other Metals, p. 32Google Scholar; Maxwell's, Electricity and Magnetism, 3rd edition, vol. ii. pp. 69, 70Google Scholar.
page 576 note * Maxwell's, Electricity and Magnetism, 3rd edition, vol. ii. p. 69Google Scholar.
page 578 note * Strictly speaking, all these fields are affected by the factor γ, (see Art. 21, i.). But in all probability this factor is practically unity.