Abstract
As a considerable amount of interest seems to have been awakened lately in meteorological spectroscopy, it may be of service to observers to call their attention to a form of pocket spectroscope specially adapted for this purpose which Mr. Adam Hilger, of 192, Tottenham Court Road, prepared for me some months ago. The compound triple prism of flint glass is mounted as nearly as possible at the minimum angle of deviation for “C.” We thus obtain a much better view of the red end of the spectrum than with the ordinary pocket-spectroscope. Mr. Hilger has also managed to secure an increa ed dispersion, which, with very perfect definition, enables me to see the lines in the so-called “rain-band” at “D” with great ease.
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DONNELLY, J. A Meteorological Spectroscope. Nature 26, 501 (1882). https://doi.org/10.1038/026501c0
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DOI: https://doi.org/10.1038/026501c0
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