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Points from Foregoing Letters

    Naturevolume 135page1002 (1935) | Download Citation

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    Abstract

    LORD RAYLEIGH reports that vitreous boron trioxide, like vitreous silica, allows helium to pass through it. Single crystals do not allow the passage of helium, and the report of a previous positive result with beryl crystal is now withdrawn.

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    https://doi.org/10.1038/1351002b0

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