Abstract
In the following note I wish to draw attention to a connection which appears to exist between the electric conductivity of certain alloys of iron and the specific heats, and hence atomic masses, of the particular elements with which the iron is alloyed. In a paper published in the ‘Transactions’ of the Royal Dublin Society the electric conductivity and magnetic permeability of a very large and, I believe, unique collection of alloys of iron is given. These alloys, it may be mentioned, have been prepared with great care by my friend, Mr. R. A. Hadfield, Managing Director of the Hecla Steel Works, Sheffield.

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