From:
Sir John Herschel
To:
James Thomas Walker
Date:
[10 December 1864]
Source of text:
RS:HS 18.16 (C: 24.77)
Summary:
Received Indian survey chart. JH's son John wrote of higher-order ellipsoidal triangles with sides based on geodesical triangles. JH objects that these violate principle of diagonal bracing. Proposes different triangles and names sites in India as apexes. Received G. B. Airy's paper on reduction.
Contributor:
John Herschel Project