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From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[13 April 1870]
Source of text:
RS:HS 6.414
Summary:

JH's letter lays terrible responsibilities at his door. Should not neglect the offer. Regarding the Julian calendar.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Thomas Brassey
Date:
[14 April 1870]
Source of text:
RS:HS 5.96
Summary:

Thanks for his pamphlet on 'Trade Unions and the Cost of Labour.' Comments on this.

Contributor:
John Herschel Project
From:
Miss B. S. Clarke
To:
Sir John Herschel
Date:
[15 April 1870]
Source of text:
RS:HS 5.346
Summary:

Discusses her theory of aerolites and the zodiacal light. Used to visit his house at Slough.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Editor of Pall Mall Budget
Date:
[20 April 1870]
Source of text:
TxU:H/L-0293; Reel 1054
Summary:

Examples from Iliad and other sources to show that military offensive tactic called 'Vertical Fire' did not originate with [L. N. M.] Carnot, as Mr. Mallet claimed in recent issue of Budget.

Contributor:
John Herschel Project
From:
Miss B. S. Clarke
To:
Sir John Herschel
Date:
[21 April 1870]
Source of text:
RS:HS 5.347
Summary:

Thanks for his letter about her theory regarding aerolites. Has another query on this question.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Duncan [Stewart]
Date:
[23 April 1870]
Source of text:
TxU:H/L-0144; Reel 1054
Summary:

No permanent optical solution to DS's double vision. Remarks on description by DS's son of cavalry duty in Ireland and Canada.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Warren de La Rue
Date:
[23 April 1870]
Source of text:
RS:HS 24.305
Summary:

Inquires about other sunspot observations made by JH.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Selwyn
Date:
[23 April 1870]
Source of text:
RS:HS 24.304
Summary:

Asks whether WS has photographs of the sun for 21 and 22 April. Notes how curious sunspot activity has been. Doubts that such is reconcilable with the notion of 'meteoric in-falls.'

Contributor:
John Herschel Project
From:
Edward Sabine
To:
Sir John Herschel
Date:
[24 April 1870]
Source of text:
Cambridge University Library 7656/H702
Summary:

Note to accompany forwarding of a letter; remarks on T. R. Robinson's upcoming cataract surgery.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Frederick Howlett
Date:
[24 April 1870]
Source of text:
RS:HS 24.306
Summary:

Writes to compare notes on sunspot observations.

Contributor:
John Herschel Project
From:
Warren de La Rue
To:
Sir John Herschel
Date:
[25 April 1870]
Source of text:
RS:HS 6.170
Summary:

Has written to Kew Observatory to send on the photographs.

Contributor:
John Herschel Project
From:
William Selwyn
To:
Sir John Herschel
Date:
[25 April 1870]
Source of text:
RS:HS 15.507
Summary:

Is sending solar autographs. Notes that in groups of spots the larger precede the smaller spots. Can JH form any theories from this?

Contributor:
John Herschel Project
From:
William Selwyn
To:
Sir John Herschel
Date:
25?] April? [1870
Source of text:
RS:HS 15.517
Summary:

Detached postscript that discusses the margins of the two photographs, which seem to show that all planets are in the near hemisphere.

Contributor:
John Herschel Project
From:
Henry Hudson
To:
Sir John Herschel
Date:
[26 April 1870]
Source of text:
RS:HS 10.30
Summary:

Would like him to accept the enclosed paper on the cause and effect of dew. Comments on various points.

Contributor:
John Herschel Project
From:
Henry James
To:
Sir John Herschel
Date:
[26 April 1870]
Source of text:
RS:HS 10.278
Summary:

The volumes of the Sinai photographs will be dispatched tomorrow. The cost of the survey has been covered by subscriptions and he will forward a statement of the account later.

Contributor:
John Herschel Project
From:
Frederick Howlett
To:
Sir John Herschel
Date:
[28 April 1870]
Source of text:
RS:HS 10.23
Summary:

Has no idea whether the sunspots appeared suddenly or gradually. The Kew people may be able to help in this matter. Comments on some more sunspots.

Contributor:
John Herschel Project
From:
Georg Adolph Erman
To:
Sir John Herschel
Date:
[28 April 1870]
Source of text:
RS:HS 7.104
Summary:

Sends two of his publications, one on terrestrial magnetism at Berlin. Comments on the results, and wonders if JH would enlist the help of the B.A.A.S. to finance further studies by H. J. R. Petersen.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Edward Sabine
Date:
[28 April 1870]
Source of text:
Cambridge University Library 7656/H727 (C: RS:HS 24.307)
Summary:

Comments on the effect of great temperature variations on the speculum of a telescope.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Edward Sabine
Date:
[28 April 1870]
Source of text:
RS MC.9.63 (C: RS:HS 24.308)
Summary:

ES has been forwarded letter explaining why 'great telescope' at Melbourne will not work and suggesting construction corrections, on which JH, who believes such 'a priori condemnation' unjustified, comments herein.

Contributor:
John Herschel Project
From:
Richard Anthony Proctor
To:
Sir John Herschel
Date:
[30 April 1870]
Source of text:
RS:HS 14.122
Summary:

Sends map from his new atlas. Reports finding a region rich in bright stars in the northern hemisphere but distinct from the Milky Way. States that in a Royal Institution lecture, he will claim that telescopes cannot reach the limits of the sidereal system and that it is far more complex than traditionally assumed.

Contributor:
John Herschel Project