Bryan Kibble

He met his future wife, Anne Greenfield, there and they married in 1964, the same year that he was awarded his DPhil on the subject of atomic spectroscopy.

Hunt, he measured the gyromagnetic ratio of the proton, which highlighted previous errors and greatly improved work on the S.I.

The realisation of the ampère had been made with a current balance, a device that is difficult to use and contains inherent problems, including that the dimensions of the coils therein need to be measured accurately.

[3][4][5] Kibble worked with Greville Rayner on coaxial a.c. bridges and the calculable capacitor from which the ohm could be realised, publishing in 1984.

Supported in his thinking during a visit by Robert D. Cutkosky of the National Institute of Standards and Technology of the US, Kibble invented the moving-coil watt balance in 1975.

This development led to the internationally accepted setting of the conventional Josephson and von Klitzing constants in 1990, obviating any further justification for national representations of these values which had previously inhibited trade.

The power of the moving mass is equal to the product of the current and potential difference measured in the coil, hence the term 'watt' balance (as the S.I.

units of length and time can be related to the mass along with the Planck constant, finally eliminating the need for usage of the platinum-iridium cylinder held at the International Bureau of Weights and Measures (B.I.P.M.)

[7] On 16 November 2018, at a meeting of the General Conference on Weights and Measures in Versailles, France, representatives of 60 countries voted to reform S.I.

in 1998, but continued to work in the field at N.P.L., the Physikalisch-Technische Bundesanstalt in Braunschweig, the B.I.P.M., and he also visited many other metrological institutions worldwide with his wife, Anne.