Abstract
THE use of optical wedges in photometry is so convenient and accurate that they are now being largely employed, but their use is, at present, mostly confined to the visible region. Dr. Toy (Phil. Mag., 1920) showed that wedges of neutral grey gelatine between quartz plates could be used down to about 3000Å.U., but the absorption coefficient, and hence the wedge-constant, was increasing so rapidly with decreasing wave-length, that they would probably become useless beyond about 2900Å.U.
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DOBSON, G., HARRISON, D. Ultra-Violet Photometry. Nature 117, 724 (1926). https://doi.org/10.1038/117724c0
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DOI: https://doi.org/10.1038/117724c0
