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The Royal Society: Science in the Making

Letter, from James Thomas Walker to Sir John Herschel, dated at 1 Cromwell Road, South Kensington

Reference number: HS/18/15

Date: 9 December 1864

Description

Autograph letter signed by sender. Sent John Frederick William Herschel 'Index Chart' of Great Trigonometrical Survey of India. Compares five triangulation methods: longitudinal series, George Everest's, G. B. Airy's, that of John Frederick William Herschel's son John, and minimum squares. John Frederick William Herschel's son and bride avoided cyclone that destroyed Calcutta Observatory.

Reference number
HS/18/15
Earliest possible date
9 December 1864
Page extent
4 pages
Format
Manuscript
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Creator name

James Thomas Walker

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Citation

James Thomas Walker, Letter, from James Thomas Walker to Sir John Herschel, dated at 1 Cromwell Road, South Kensington, 9 December 1864, HS/18/15, The Royal Society Archives, London, https://makingscience.royalsociety.org/items/hs_18_15/letter-from-james-thomas-walker-to-sir-john-herschel-dated-at-1-cromwell-road-south-kensington, accessed on 07 March 2026

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https://makingscience.royalsociety.org/items/hs_18_15/letter-from-james-thomas-walker-to-sir-john-herschel-dated-at-1-cromwell-road-south-kensington

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  • Herschel Letters

    This collection of nearly 10,900 letters, drafts, copies and notes is the largest repository of scientific correspondence from and to Sir John Herschel, leading figure of Victorian science.

    Dates: 1807 - 1875

    View collection