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    • Thin Evaporated Calcium Fluoride Films - Nature

      Nature· 7 days ago

      The powder X-ray camera used was of the Seeman–Bohlin focusing type. Consequently it was only the portions of the spectral lines due to the scattering in the immediate region ...

    • Sound Recording on Magnetic Film - Nature

      Nature· 6 days ago

      W. ALDOUS, technical secretary of the British Sound Recording Association (BCM/BSRA, London, W.C.1), has written directing attention to the fact that the use of an iron powder