Abstract
A FEW weeks ago I wrote a short article for NATURE under the above title, describing an instrument for the measurement of radiation in heat units which was based upon the principle of the integration of temperature by the distillation of water in vacuo. Since then Mr. Edward Vivian, M.A., has kindly written me a very interesting letter, in which he says that he had several forms of an instrument based upon essentially the same principles, made for him by Messrs. Negretti and Zambra many years ago, and that some of them are still in use in his garden at Torquay. Mr. Vivian's instruments were shown at the British Association (B.A. Report, 1856, p. 48) and at the Royal Institution of Great Britain (Journal, R. I., 1857, p. 438), but no description of them appears to have been printed, which probably accounts for their not being more generally known.
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CLARK, J. On a Radiant Energy Recorder. Nature 32, 343 (1885). https://doi.org/10.1038/032343b0
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DOI: https://doi.org/10.1038/032343b0
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