The so-called international electrical units

F. A. Wolff
1904 Bulletin of the Bureau of Standards  
proved the silver voltameter to be more reliable than the copper voltameter, and this led to the general use of the well-known form, the specifications of which have been adopted in connection with the legal definition of the ampere, and are practically identical in the United States/ England,^and Germany.^This type has consequently been used, sometimes with only slight modifications, in a large number of investigations; but as the demands upon the accuracy of the results increased, it became
more » ... reased, it became more and more apparent that it presented a number of peculiarities, and the thorough researches on the behavior of this voltameter by Kahle* and others soon created the impression that the results obtained with a silver voltameter can not lay any claim to a high degree of accuracy. Until recently the attempts to find the source of trouble in the voltameter have been rather unsuccessful, different investigators arriving at different conclusions regarding the influence and nature of the disturbing factors. While it must be conceded that in two voltameters of the usual form, when arranged in series and treated in exactly the same manner, the same quantity of electricity will yield deposits differing in weight not more than 1 in 5,000, or even 1 in 10,000;
doi:10.6028/bulletin.004 fatcat:h7x2avpcvjh7pmz3ikxauxqetm