Search: Herschel, John in correspondent 
Talbot, William Henry Fox in correspondent 
Herschel, John in addressee 
letter in document-type 
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From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[29 March 1843]
Source of text:
RS:HS 17.315
Summary:

Suggests 'amphitype' as name for JH's process whereby same picture can go from negative to positive. Further comments on comet sighting, and on some improvements to Daguerreotype.

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[5 April 1843]
Source of text:
RS:HS 17.316
Summary:

Comments on JH's positive calotype. Suggests comet may be return of (J.-D.) Cassini's comet of 1668. Gives theorem for finding parabolic orbit of comet if two observations are made in the ecliptic.

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[8 September 1844]
Source of text:
RS:HS 17.317
Summary:

Some comments and questions on mathematics.

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[16 September 1844]
Source of text:
RS:HS 17.318
Summary:

Comments and questions about a 'cone of the second order' in mathematics.

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[20 October 1847]
Source of text:
RAS:JH Archive 10/5.66; Reel 9
Summary:

Grateful for receipt of JH's Cape Results. Sending photographs by several artists to show that 'knowledge of the art is spreading.'

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[26 October 1847]
Source of text:
RS:HS 17.319
Summary:

Comments on astronomical symbols, and position of camera when photographing buildings.

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[4 February 1848]
Source of text:
RS:HS 17.320
Summary:

Has performed experiments measuring the deviation of spectra through an obliquely placed diffraction grating. Believes they strongly support the wave theory of light.

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[27 November 1850]
Source of text:
TxU:H/M-0547; Reel 1093
Summary:

Congratulates JH on appointment to Mastership of Mint. Hopes JH, as member of Cambridge University Commission, will introduce needed reforms.

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
1851-5-6 or earlier
Source of text:
RS:HS 17.321
Summary:

Refers to process which produces pictures that are negative or positive depending upon the light. Hopes to use it to photograph lunar landscape. Wants to call it 'amphitype' if JH agrees.

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[26 August 1851]
Source of text:
RS:HS 17.322
Summary:

Describes observing solar eclipse at Marienburg in eastern Prussia. Gives advice about whom to see for photography training [see 1851-7-27].

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[13 November 1853]
Source of text:
RS:HS B26.48
Summary:

Willingly gives JH permission to engrave a portrait photograph taken with WT's process. WT asks JH if he would be willing to testify on WT's behalf if necessary, relating to infringement of patent rights. WT announces that John Hind has discovered another asteroid [Euterpe].

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[15 May 1854]
Source of text:
RS:HS B26.49
Summary:

Asks JH to sign an affidavit that WT is the inventor of the calotype or talbotype as some are trying to break WT's patent hold.

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[18 May 1854]
Source of text:
RS:HS B26.50
Summary:

Sends JH a copy of the affidavit [see WT's 1854-5-15] and asks for JH's emendations, if any, and his signature. Sends JH a photograph engraved on steel.

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[20 May 1854]
Source of text:
RS:HS B26.52
Summary:

Explains the way an affidavit works in the Court of Chancery. Because JH feels uncomfortable about certain aspects of the affidavit, WT will not trouble him about it again.

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[23 May 1854]
Source of text:
RS:HS B26.54
Summary:

WT's opponents have named JH in one of their affidavits against WT. WT is therefore asking JH to respond to what is stated in that affidavit.

Contributor:
John Herschel Project
From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[26 May 1854]
Source of text:
RS:HS B26.55
Summary:

Reports to JH that the patent infringement case had been decided in WT's favor, and tells of one incident in court.

Contributor:
John Herschel Project