Abstract
LONDON. Royal Society, June 18.—“Magnetisation of Liquids.” By John S. Townsend. The experiments on the coefficient of magnetisation of liquids were made with a sensitive induction balance. Both circuits were commuted about sixteen times a second, so that very small inductances could be detected by the galvanometer in the secondary circuit. The principle of the method consisted in balancing the increase of the mutual induction of the primary on the secondary of a solenoid arising from the presence of a liquid in the solenoid against known small inductances. Thus, if the sum of the inductances be reduced to zero, as shown by the galvanometer in the secondary giving no deflection, the balance will be disturbed to the extent 4πkM, due to the insertion of a liquid into the solenoid whose coefficient of magnetisation is k, and the galvanometer in the secondary circuit will give a deflection when the commutator revolves. An adjustable inductance is then reduced by a known amount, m, till the deflection disappears; so that we get 4πkM = m ∴ k = m/4πM, where m and M are quantities easily calculated.
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Societies and Academies. Nature 54, 311–312 (1896). https://doi.org/10.1038/054311b0
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DOI: https://doi.org/10.1038/054311b0