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Walker, James Thomas in correspondent 
Herschel, John in author 
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Herschel7804

From:
Sir John Herschel
To:
James Thomas Walker
Date:
[24 December 1863]
Source of text:
RS:HS 18.12
Summary:

Received tables of heights recorded in 'Sind, the Punjab, N.W. Provinces, and Central Asia.' Sees scientific interest in JW's described effect of refraction on levelling. Work is important to irrigation.

Contributor:
John Herschel Project

Herschel7808

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
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