Magnetic and Electrical Dimensions

Abstract

IN his letter in NATURE of March 13, Prof. Howe avoids the very plain question put to him by Sir James Henderson. That question is: ” What justification has he for writing 1/A?” The only suggestion put forward by Prof. Howe is that ” the forces between magnetic poles and those between electric currents must involve the same property of space”. But that condition is equally met by writing A—which is Henderson's proposal. In view of the strictures in Prof. Howe's review, it is clearly incumbent upon him to face this issue, and make his reasons for his choice as clear as those of Sir James; and I hope that he will do this.