Abstract
I HAVE found the clear photographs of the antinodal ring of dust in a Kundt's tube which were published in NATURE on Nov. 9, p. 724, by Prof. Andrade and Mr. Lewer of special interest inasmuch as, while using a rod excited tube and Kieselsäure powder, I observed (Phil. Mag., vol. 7, p. 523, March 1929) an antinodal cloud and stated that “the antinodes are marked almost as definitely as the nodes”. As the dust was photographed when the note had ceased, a photograph as detailed as that of Prof. Andrade and Mr. Lewer was not obtained, although a ring-like grouping at the antinode is clearly suggested in Fig. 7 (c′) (1.c.).
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IRONS, E. New Phenomena in a Sounding Dust Tube. Nature 124, 914 (1929). https://doi.org/10.1038/124914b0
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DOI: https://doi.org/10.1038/124914b0
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