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Tyndall writes: 'In reference to one of the powerful fog-whistles established on the coast of Maine, General Duane remarks as follows :—“The most perplexing difficulties, however, arise from the fact that the signal often appears to be surrounded by a belt varying in radius from 1 to 1½ mile from which the sound appears to be entirely absent. Thus, in moving directly from a station the sound is audible for the distance of a mile, is then lost for about the same distance, after which it is again distinctly heard for a long time. This action is common to all ear signals, and has been at times observed at all the stations, at one of which the signal is situated on a bare rock 20 miles from the mainland, with no surrounding objects to affect the sound."' He presents his observations on 'the disappearance of the sound' and asks whether this is worth publication in the Proceedings of the Royal Society.

Annotations in pencil and ink.

Subject: Physics / Sound

Received 21 March 1882.

Written by Tyndall at the Royal Institution [London].

A version of this letter was published in volume 34 of the Proceedings of the Royal Society as 'Note on General Duane’s soundless zones'.

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Earliest possible date
21 March 1882
Physical description
Ink and graphite pencil on paper
Page extent
2 pages

Creator name

John Tyndall

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John Tyndall, Letter, 'Note on General Duane's soundless zones' from John Tyndall to [George Gabriel] Stokes, 21 March 1882, PP/2/2, The Royal Society Archives, London,, accessed on 16 July 2024

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  • Proceedings Papers

    Dates: 1882 - 1894

    The archival collection known as 'Proceedings Papers' is comprised of manuscripts and occasional proofs of scientific papers sent to the Royal Society which were read before meetings of Fellows and printed in full in the Proceedings of the Royal Society.

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