Masseinheiten (International Conference on Electrical Units) Held 23–25 October at Physikalisch-Technischen Reichsanstalt at Charlottenburg. The 1904 Congress recommended holding an international conference to address discrepancies in the electrical units and their interpretation. Emil Warburg, president of the Physikalisch-Technische Reichsanstalt in Germany, invited representatives from corresponding national laboratories in the United States (National Bureau of Standards), the United Kingdom (National Physical Laboratory), and the official standards commissions in Austria and Belgium to an informal conference on electrical standards and units. Additionally Mascart (France), Rayleigh (United Kingdom) and Carhart (USA) were invited because of their expertise and influence. Thirteen of the fifteen invited persons participated in the conference, six from the Reichsanstalt, two from the Belgian Commission on Electrical Units, two from the Austrian Commission on Standardization, Richard Glazebrook from the National Physical Laboratory, Mascart, and Carhart. The non-attendees were Samuel Wesley Stratton, director of the National Bureau of Standard, who sent three papers outlining the positions and proposals of the Bureau, and Rayleigh. A proceedings was published. Concentrated on the redefinition of the ohm, ampere, and volt, as resolved in the 1904 Congress. The aim was to attain true international uniformity in definitions of these concepts. The main question was whether ohm, ampere, and volt should be independent of each other, or only two should be defined, and which two. The conference concluded that only two electrical units should be taken as fundamental: the international ohm and the international ampere. It also adopted the Western Cadmium Cell as the standard cell, and added rules about the preparation and use of the mercury tube, whose geometry was specified at the 1893 Congress. The conference resolved that another international conference in the course of a year should be held to establish an agreement about the electric standards in use, because different countries had different laws about electrical units. 1908 in Marseille Held 14–19 September, in connection with the L'exposition internationale des applications de l'électricité. A three-volume proceedings was published. References International standards International conferences 1881 conferences 1893 conferences 1900 conferences 1904 conferences 1908 conferences History of electrical engineering