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Prior to the adjustment of the electrical units in 1948, t h e value of a curren t bad been determined in absolute units by means of a current balance and simultaneously measured in NBS amperes by comparison with standard resistors and standard cells. Th is work was reported in RP1449. Similar measurements made recent ly with an electrody namometer indicate a possible change in t he values of t he standards . The present paper reports a repetit ion of t he work described i'n" RP1449. The purpose of this remeasurement was to determine whether or not the ~t'andards had cbanged . Only minor changes were made in t he equipment in order that factors which might ha ve introduced small systematic errors in the results would r emain unchanged. According t o the work described in t his paper, 1 N BS ampere = 1.8 ab30lu te amperes. R ecent work with the P ellat electrodynamometer gave the result 1 BS a mpcre 1.000013 absolute amperes. The weighted mean of t hese two values is

Measurement of current with the National Bureau of Standards current balance