Find The Standard-Cell Comparator, A Specialized Potentiometer (Classic Reprint) Depicted By H B Brooks Available As Publication

from The StandardCell Comparator, a Specialized Potentiometer

In recent years, however, the movement for the revision of the values of the electrical units has accentuated the demand for high precision and reliability in the intercomparison of primary standards.
For example,

it is desirable that the absolute measurements of current now under way in several national laboratories shall give results agreeing topart in when reduced to a common basis.
To do this, it is desirable that each laboratory should know the values of its resistance standards and standard cells, in terms of its inter national ohm and volt, topart in This in turn means that it would be desirable to hold down fortuitous errors in the comparison of its working coils and cells with those representing its units to one or two units in the next decimal place that is, toorparts in The extension of the accuracy of a class of measurements by an additional decimal place requires recourse to refinements and precautions previously regarded as uncalled for.


This paper describes a special potentiometer which is used in the standardcell laboratory of the Bureau of Standards.
In its design and construction all available precautions and refinements have been utilized in order that it shall meet the exacting requirements of the new era in the history of the electrical units.


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