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Dewar writes: 'The former paper, entitled “Studies on the Electric Arc," [Proceedings of the Royal Society, volume 30] together with the numerous observations made conjointly with Professor Liveing on the spectrum of the arc discharge between carbon electrodes in different gases, led me to ascertain if the interior of the gaseous envelope of the ordinary arc showed any peculiarities of pressure. Pressure might be caused by the motion of the gas particles, the transit of material from pole to pole, electric action, or indirectly by chemical combinations taking place in the arc. As any effect due to the above causes must necessarily be very small, a delicate manometer capable of measuring easily the 1/100th of a millimetre of water pressure had to be employed.'

Annotations in pencil and ink throughout.

Subject: Electricity

Received 14 January 1882. Read 19 January 1882.

A version of this paper was published in volume 33 of the Proceedings of the Royal Society as 'Manometric observations in the electric arc'.

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Ink and graphite pencil on paper
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5 pages

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James Dewar

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James Dewar, Paper, 'Manometric observations in the electric arc' by [James] Dewar, 1882, PP/1/22, The Royal Society Archives, London,, accessed on 20 May 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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