Lord Kelvin

Paul Tunbridge, a Chartered Engineer and member of the Institution of Mechanical Engineers, started his career at RAF Halton and completed his engineering studies at technical Colleges in Cheltenham and Corby. Following war and overseas service and various staff posts, including several years at the Air Ministry, he opted in 1955 for early retirement to become Personal Assistant to the Chief Engineer in the design office of Vickers-Armstrongs (Aircraft), Weybridge. In 1960 he joined the Central Office of the international Electrical Commission in Geneva where he was Head of Linguistic Services before retiring in 1986. The author's interest in the history of science and engineering standards has extended over many years. He has had a number of papers published in Notes and Records of the Royal Society and elsewhere on Michael Faraday, Lord Kelvin, Benjamin Franklin etc. On three occasions, he received the Prix Robert Harvey from the University of Geneva. His paper 'The first experimental air-cushion machine' - which the author discovered had been invented as far back as 1866 by Professor Marc Thury of Geneva - was jointly published by the Newcomen Society and the Institution of Mechanical Engineers. As well as gaining first prize in an international competition organised by the Italian National Standards Association (UNI) in 1971 for his monograph on standardization, he received from the British Standards Society in 1987 the Fred Butcher Memorial Award for his paper 'The quality factor in company standardization'.

Chapter 1: Kelvin and electrical science
Chapter 2: Kelvin and the metric system
Chapter 3: Metric controversy in Britain and the USA
Chapter 4: Electrical measurements
Chapter 5: Kelvin and the British Association Electrical Units
Chapter 6: International Electrical Congresses
Chapter 7: Units and standards for the electrical century
Chapter 8: Kelvin, Crompton and the electrical industry
Appendix A: James Watt and the metric system
Appendix B: Kelvin and screwthread standards
Appendix C: Metrication in Britain
Appendix D: International electrotechnical terminology
Appendix E: A letter by William Thomson on the 'Thomson Effect'
Appendix F: Crompton's Patents 1878-1899