On the change of resistance in iron produced by magnetisation

The experiments described below were made with the object of determining simultaneous values in a specimen of soft iron wire of the magnetising force, the magnetisation, and the change of resistance due to magnetisation. In all the measurements hitherto made of magnetic changes of resistance no attempt seems to have been made to determine at the same time the magnetisation; in fact, the results which have been obtained for bismuth might appear to indicate that there is but little, if any, connection between magnetisation and change of resistance. The results herein described, on the other hand, indicate that there is a somewhat close connection between the two phenomena, and make it clear that further measurements on similar lines would have some value.