Abstract
THE following Report of the Committee appointed by the-Board of Trade, in December 1891, βto inquire into and report to them upon the subject of the standards to be used for testing the illuminating power of coal gas,β has just been published as a Parliamentary paper.
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Photometric Standards. Nature 52, 356β357 (1895). https://doi.org/10.1038/052356a0
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DOI: https://doi.org/10.1038/052356a0