Paper, 'Note on the theory of the alternate current dynamo' by John Hopkinson
Reference number: PP/10/20
Date: 1887

Description
Hopkinson writes: 'According to the accepted theory of the alternate current dynamo, the equation of electric current in the armature is γy + Ry = periodic function of t, where γ is a constant coefficient of self-induction. This equation is not strictly true, inasmuch as γ is riot in general constant, but it is a most useful approximation. My present purpose is to indicate how the values of γ and of the periodic function representing the electromotive force can be calculated in a machine of given configuration.'
Annotations in pencil and ink throughout. Includes one diagram of Hopkinson's proposed dynamo.
Subject: Physics / Electricity
Received 17 February 1887. Read 10 March 1887.
A version of this paper was published in volume 42 of the Proceedings of the Royal Society as 'Note on the theory of the alternate current dynamo'.
- Reference number
- PP/10/20
- Earliest possible date
- 1887
- Physical description
- Ink and graphite pencil on paper
- Page extent
- 6 pages
- Format
- Manuscript
Diagram
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Citation
John Hopkinson, Paper, 'Note on the theory of the alternate current dynamo' by John Hopkinson, 1887, PP/10/20, The Royal Society Archives, London, https://makingscience.royalsociety.org/items/pp_10_20/paper-note-on-the-theory-of-the-alternate-current-dynamo-by-john-hopkinson, accessed on 06 February 2025
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Related Publications
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II. Note on the theory of the alternate current dynamo External link, opens in new tab.
Date: 31st December 1887
DOI: 10.1098/rspl.1887.0032
Hierarchy
This item is part of:
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Scientific papers published in the Proceedings of the Royal Society volume 42, 1887
1887 Reference number: PP/10
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John Hopkinson
Author
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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.View collection