[Letters to the Editor]


THE discovery described above was made by Dr. Penrose in the autumn of 1948. After his tragic death on April 28, 1949, I wrote this note, making use of a draft written by Dr. Penrose while in hospital.


  1. 1

    Pound, R. V., Phys. Rev., 73, 745 (1947).

    Google Scholar 

  2. 2

    Polder, D., Physica, 9, 709 (1942).

    ADS  CAS  Article  Google Scholar 

  3. 3

    Gorter, C. J., Physica, 14, 504 (1948).

    ADS  Article  Google Scholar 

  4. 4

    Bagguley, D. M. S., Bleaney, B., Griffiths, J. H. E., Penrose, R. P., and Plumpton, B. I., Proc. Phys. Soc., 61, 542 and 551 (1948). Bagguley. D. M. S., Griffiths, J. H. E., and Pryce. M. H. L. Nature, 162, 538 (1948).

    ADS  CAS  Article  Google Scholar 

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GORTER, C. [Letters to the Editor]. Nature 163, 992 (1949). https://doi.org/10.1038/163992b0

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