An article based on a paper with the full title ‘An a.c. doublebridge with inductively coupled ratio arms for precisionplatinum-resistance thermometry’, which is published this monthin the Proceedings. The paper will be read at a meeting of theScience and General Division on the 5th February 1963 atSavoy Place in support of a lecture on ‘The role of theplatinum-resistance thermometer in the international practical scale oftemperature’ by J.A. Hall.