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Progressive Lightning: A New Stereoscope

Nature volume 131, pages 492494 (08 April 1933) | Download Citation



A MOST interesting and illuminating paper on the subject of progressive lightning by Dr. E. C. Halliday1 describes the results of successful experiments made by himself in South Africa at the instance of Dr. B. F. J. Schonland with an instrument similar to that which I made in the year 1900. As I gave the first description of my instrument in NATUKE2 and have contributed other articles on this subject exclusively to these columns3 I should be glad to use the same medium for some observations on Dr. Halliday's paper and at the same time describe a new stereoscope designed to examine these photographs without cutting them and also to obtain the physiological advantage of contrast due to reversed stereoscopic effect.


  1. 1.

    Phil Mag., Feb. 1933.

  2. 2.

    NATURE, 118, 749, Nov. 20, 1926.

  3. 3.

    NATURE, 122, 310, Sept. 1, 1928; 124, 54, July 13, 1929; and 127, 425, March 14, 1931.

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