These two experiments were formally recognized until the 1930s as the basis of the international ohm and ampere.
Rosa were in reasonable agreement, and the committee recommended that all countries use, as the international ohm, the mean of the values found by Germany and Great Britain [2, 5].
Curtis , "during the last two decades not one of the national laboratories has reestablished its unit for the international ohm by making measurements upon the mercury ohm.
To do this, it is desirable that each laboratory should know the values of its resistance standards and standard cells, in terms of its international ohm
and volt, to 1 part in 1,000,000.