Some investigations on the axial spin of a magnet and on the laws of electromagnetic induction

The object of these experiments is to extend certain investigations by Faraday which have been the subject of much controversy. They concern the relations between a cylindrical magnet spinning about its axis and the currents and forces set up thereby in a neighbouring conducting circuit, of which the magnet may or may not form a part. The similarity between cylindrical magnets and solenoids is examined, as well as the effect produced by one spinning magnet upon another. The bearing of these experiments upon the laws of electromagnetic induction is explained, and certain special experiments on this subject are included. The conclusions reached are given in Section (15); and in an Appendix some practical applications are described.