The M.K.S. or Giorgi system of units. The case for its adoption

The paper begins with a résumé of the decisions of the International Electrotechnical Commission, expressing approval of the M.K.S. system, and includes the text of the proposals adopted. Its underlying principles are then explained, showing that it is not designed to supersede the C.G.S. system, but that it is an extension of the present set of practical units into a complete absolute system, which embodies mechanical, electrical and magnetic units, which stands on its own fundamental definitions, and which is intended to replace the mixed system of practical units and C.G.S. units customarily used by electrical engineers. A list of the principal units of the M.K.S. system is given, together with their definitions. Ampÿre´s and Coulomb´s laws together with their derivatives are discussed with reference to the mathematical principles and units involved. The effect of the special theory of relativity, in accordance with which Ampÿre´s law may be deduced from Coulomb´s law, and the resulting simplification of the theory of dimensions are explained. The place of the M.K.S. system in teaching is discussed. It is pointed out that rationalization is not an inherent part of the M.K.S. system, but as the rationalized M.K.S. system is extensively employed by those who prefer to use rationalized units, its use is considered in an Appendix.