= A. F. Clark
{c}
A researcher explicitly credited with measurements used to certify a <superconducting critical current> standard. Testing the same <niobium-titanium> wire under controlled <magnetic field> and <temperature> provides a practical check of whether different laboratories obtain comparable current-carrying capacities.<Standard Reference Materials: Critical current measurements on an NbTi superconducting wire standard reference material by A. F. Clark and others>[Appendix B, printed pp. 50–51: measurement credit and reference conditions]{ref}
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