IV. Magnetic properties of alloys of nickel and iron

Abstract

Several alloys have been examined, supplied to me very kindly by Mr. Riley, of the Steel Company of Scotland. I confine myself to a brief statement of the results with the most interesting sample. Mr. Riley informs me that this sample contains 25 per cent. of nickel. As the material was given to me it was non-magnetic at ordinary temperature, that is to say, the permeability was small, about 1·4, and the induction was precisely proportional to the magnetising force. The ring on being heated remained non-magnetic up to 700°C. or 800°C. A block of the material did not recalesce on being heated to a high temperature and being allowed to cool. On being placed in a freezing mixture the material became magnetic at a temperature a little below freezing point.