Abstract
IT has been supposed that the difference between the zenith distance of a star obtained by direct observation and that obtained by observing it reflected in a pool of mercury—as it is not fully explicable as the result of the flexure of the telescope-tube—is partly to be accounted for as the result of abnormal refraction in the neighbourhood of the instrument, owing to varying air-temperatures in the room. It is within the tube of the instrument that these things are to be looked for.
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RENTON, J. Refraction Within Telescope Tube . Nature 63, 334–335 (1901). https://doi.org/10.1038/063334a0
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DOI: https://doi.org/10.1038/063334a0