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Herschel7807

From:
James Thomas Walker
To:
Sir John Herschel
Date:
[9 December 1864]
Source of text:
RS:HS 18.15
Summary:

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

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

Herschel7809

From:
James Thomas Walker
To:
Sir John Herschel
Date:
[15 December 1864]
Source of text:
RS:HS 18.17
Summary:

Indian Triangulation chart showed progress to May 1862. Explains why arcs of meridians and parallels were chosen over diagonal braces. G. B. Airy's method of determining errors helped. Will take note and package from Maria [Herschel] to JH's son John.

Contributor:
John Herschel Project

Herschel9367

From:
William J. Edge
To:
Sir John Herschel
Date:
[23 December 1864]
Source of text:
RS:HS 7.119
Summary:

Sending a weather almanac by a person called Orlando Whistlecroft. Comments on his weather forecasting.

Contributor:
John Herschel Project

Herschel9378

From:
Sir John Herschel
To:
Friedrich Wilhelm Rudolph Engelmann
Date:
[12 December 1864]
Source of text:
RS:HS 7.131 (C: RS:HS 24.78)
Summary:

Thanks for the valuable series of measures of double stars. Regarding JH's method of calculating the orbit of a double star, which RE seems to have misunderstood.

Contributor:
John Herschel Project

JHC1140

From:
Sir Joseph Dalton Hooker
To:
Dr Thomas Anderson
Date:
30 December 1864
Source of text:
JDH/2/3/1 f.79-80, The Royal Botanic Gardens, Kew
Summary:

No summary available.

Contributor:
Hooker Project

Tyndall2189

From:
William Garland Barrett
To:
John Tyndall
Date:
December 7. 1864
Source of text:
03--04b, UCL
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2190

From:
William Frederick Pollock
To:
John Tyndall
Date:
9th Dec. / 64
Source of text:
MS JT/1/P/234; MS JT/1/TYP/6/2034, RI
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2191

From:
Adelheid Clausius
To:
John Tyndall
Date:
13. Dec. 64
Source of text:
MS JT/1/TYP/7/2270, RI
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2192

From:
Rudolf Clausius
To:
John Tyndall
Date:
13/12/64
Source of text:
MS JT/1/TYP/7/2271-2, RI
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2193

From:
William Frederick Pollock
To:
John Tyndall
Date:
16th Dec. /64
Source of text:
MS JT/1/P/235; MS JT/1/TYP/6/2035, RI
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2194

From:
George Busk
To:
John Tyndall
Date:
Dec. 17th 1864
Source of text:
MS JT/1/B/163; MS JT/1/TYP/1/179, RI
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2195

From:
George Gabriel Stokes
To:
John Tyndall
Date:
17th Decr 1864
Source of text:
MS JT/1/S/238; MS JT/1/TYP/4/1397, RI
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2196

From:
John Tyndall
To:
Juliet Pollock
Date:
Monday
Source of text:
MS JT/1/T/1180; MS JT/1/TYP/6/2077, RI
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2197

From:
Edward Sabine
To:
John Tyndall
Date:
Undated
Source of text:
29 (1865), pp. 218-31, Phil. Mag.
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2198

From:
John Tyndall
To:
William Francis
Date:
Tuesday Evg
Source of text:
Authors' Letters, St Bride Library
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2199

From:
John Tyndall
To:
Thomas Archer Hirst
Date:
Wednesday
Source of text:
MS JT/1/5/12, RI
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2200

From:
John Tyndall
To:
William Frederick Pollock
Date:
Undated
Source of text:
MS JT/2/13c/1272-3, RI
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2201

From:
John Tyndall
To:
William Francis
Date:
26th Dec
Source of text:
Authors' Letters, St Bride Library
Summary:

No summary available.

Contributor:
Tyndall Project

Tyndall2202

From:
William Frederick Pollock
To:
John Tyndall
Date:
Tueday 27th Dec. 1864
Source of text:
MS JT/2/10, RI
Summary:

No summary available.

Contributor:
Tyndall Project
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