Search: Herschel, John in correspondent 
De Morgan, Augustus in correspondent 
1850-1859 in date 
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From:
Sir John Herschel
To:
Augustus De Morgan
Date:
1850-1
Source of text:
RS:HS 23.80
Summary:

Comments on calculation by Frédéric Petit of the hyperbolic orbit of the meteor of 19 Aug. 1847.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[21 January 1850]
Source of text:
RS:HS 6.256
Summary:

Regarding the delicate case of priority of investigation. Quotes example of Henry Warburton and John Brinkley.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[24 January 1850]
Source of text:
RS:HS 23.81
Summary:

About Henry Warburton's theorem, and the Gregorian calendar.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[25 January 1850]
Source of text:
RS:HS 6.257
Summary:

Further regarding the Gregorian calendar and comments on some of the questions involved in its interpretation.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[4 February 1850]
Source of text:
RS:HS 6.258
Summary:

Would he drop him a few lines on the orbit of the meteor for the R.A.S. Robert Potts of Trinity is to publish by subscription a translation of Robert Simson's Porisms.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[16 March 1850]
Source of text:
RS:HS 23.85
Summary:

About JH's poor health; some problems in perspective. Having read a book on Egyptology, JH wanders off in flights of fanciful numerology.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[26 March 1850]
Source of text:
RS:HS 6.259
Summary:

Has never heard the polar axis approximation. JH's treatise on perspective must be very complete. John Taylor is his old publisher. Has got 64 more syllogisms symbolized.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[26 August 1850]
Source of text:
RS:HS 6.260
Summary:

Guessed the name of his friend. Has not read the article attentively yet. If JH is in the south of France he may meet H. P. Brougham (Baron Brougham and Vaux) opticizing. Picked up an old book on the reformation of the calendar owned by C. Clavius 1556. Has sent to Rome for signature.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[15 October 1850]
Source of text:
unknown
Summary:

Raises a question regarding the size of an infinitely small quantity. Argues that 1850 is the last year of the first half of the nineteenth century.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[7 January 1851]
Source of text:
RS:HS 23.94
Summary:

About JH's poor health; mentions discovery of two asteroids and new rings of Saturn.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[25 August 1852]
Source of text:
RS:HS 6.261
Summary:

Has been examining and sorting all Francis Baily's correspondence with a view to its preservation. Suggests Greenwich as a suitable repository for most of it. Will be returning JH's letters for his selection of important letters to be preserved.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[28 August 1852]
Source of text:
RS:HS 23.124
Summary:

Comments on astronomical discoveries, and depressing life in London.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[29 August 1852]
Source of text:
RS:HS 6.262
Summary:

The job [of sorting Francis Baily's correspondence] may be done at leisure. All his family are at Herne Bay. Regarding chronology. Annibal De Gasparis will be equal with J. R. Hind when he locates another planet. Is astonished how well books last.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
1853
Source of text:
RS:HS 23.131
Summary:

JH looking for some writings by Isaac Newton while at the Mint, but most of that seems to have vanished.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[25 March 1853]
Source of text:
RS:HS 6.263
Summary:

The book on the coinage of England in the 1670s is by one William Jeake. Comments on the diversity of coins available at that date and how their values changed by proclamation. Should the present coinage be decimalized he hopes the half crown will be withdrawn.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[11 April 1853]
Source of text:
RS:HS 23.130
Summary:

Asks for the experience of other countries in introducing decimal coinage.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[3 August 1853]
Source of text:
RS:HS 6.264
Summary:

Has he heard the names of the coins decided on by the Commons when the Pound is decimalized? W. R. Hamilton has informed him that he has heard from JH. Is going to the seaside tomorrow.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[9 August 1853]
Source of text:
RS:HS 23.138
Summary:

Thanks for AD's report on coinage [see JH's 1853-4-11], and for AD's puns.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[10 August 1853]
Source of text:
RS:HS 6.265
Summary:

Intends to send on Francis Baily's letters soon. Would like to see the coinage report.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[30 August 1853]
Source of text:
RS:HS 6.266
Summary:

Is sending the packet of Francis Baily's letters today. Sees that Thomas Wright, the Milky Way man, kept a shop in Fleet St. and was a mathematical instrument maker. Warren de La Rue has doubtless sent him his picture of Saturn.

Contributor:
John Herschel Project