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Consulting Engineers, 8 Queen Anne's Gate, London.
1882 Philip Cardew, whilst in the Royal Engineers, assisted in experiments with electric searchlights. He conceived the idea of the hot-wire galvanometer, one of the first direct reading meters, for which he was awarded a gold medal at the London Exhibition of 1885. He also came up with a method of measuring the efficiency of a dynamo.
1894 Philip Cardew retired from the Royal Engineers
1898 Cardew retired from the Board of Trade. He then entered into partnership with Sir William Preece and his sons, Llewellyn and Arthur, as consulting engineers. The firm was known as Preece and Cardew.
1920 Preece, Cardew, Snell and Rider - the partnership of A. H. Preece, J. F. C. Snell, J. H. Rider and J. H. Woodward was dissolved; A. H. Preece, J. H. Rider and J. H. Woodward would carry on business as consulting engineers under the title Preece, Cardew and Rider.