Letter from J A [James Alfred] Ewing, Engineering Laboratory, Cambridge, to [Joseph] Larmor He would like to talk to Larmor about the subject of his letter, since it would take too long to write out what he thinks. He discusses magnetic retentiveness and the resistance in rotation of Weberian molecular magnets. Ewing believes he has gotten rid of any notion of ordinary friction between solids playing a part, and that mutual magnetic forces of the molecules can explain the resistance. He describes the ceasing break up of groups of molecules in rotating iron in a magnetic field. He thinks Larmor is quite right in saying that complete saturation would be incompatible with resistance to rotation in a magnetic field. He notes the idea of molecules having a 'brake-strap' around them, and the alignment of molecules along the line of the field. If Larmor can come to see him, he will show a model which will explain the real behaviour of molecules. Ewing concludes with his opinion that [Francis Gibson?] Baily's discussion of eddy currents as beside the point. 4 October 1894