Abstract
IN the recent interesting article on the Oldebroek explosion, it is stated (NATURE, January 6, p. 33) that in no case has it been found that the nearer margin of the outer sound-area lies at so short a distance as 114 km. from the source. When the minute-guns were fired at Spithead during Queen Victoria's funeral procession on February 1, 1901, there was a clearly marked silent zone, and the nearest point of the outer sound-area was 80 km. from the flagship. In this case the sounds were easily recognised, as they recurred at regular intervals (Knowledge, vol. 24, 1901, pp. 124–25 ; Science Progress, vol. 14, 1920, pp. 625–26). In the sound-area of one of the Asama-yama explosions (December 25, 1910) the corresponding distance was about 87 km. (Bull. Imp. Earthq. Inves. Com., vol. 6, 1912, pp. 61–63 and plate 18). These figures have an important bearing on the origin of the silent zone.
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DAVISON, C. The Silent Zone in Explosion Sound-Areas. Nature 111, 117 (1923). https://doi.org/10.1038/111117b0
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DOI: https://doi.org/10.1038/111117b0
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