Search: Herschel, John in addressee 
John Herschel Project in contributor 
Herschel, John in correspondent 
Talbot, William Henry Fox in correspondent 
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Herschel1362

From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[18 April 1842]
Source of text:
RS:HS 17.311
Summary:

Sends JH samples of his calotypes. Off to Germany on a photographic expedition.

Contributor:
John Herschel Project

Herschel1363

From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[2 June 1842]
Source of text:
RS:HS 17.312
Summary:

Carl Steinheil has proposed making telescope mirrors by plating silver on glass. Is writing to JH to tell him that somewhat earlier he had included this process in one of his patents.

Contributor:
John Herschel Project

Herschel1364

From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[22 March 1843]
Source of text:
RS:HS 17.313
Summary:

JH's account of a comet reminds WT of a strange sighting many years ago. Comments further on improvements in photography, both those made and those needed.

Contributor:
John Herschel Project

Herschel1365

From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[24 March 1843]
Source of text:
RS:HS 17.314
Summary:

Describes observing of comet that evening.

Contributor:
John Herschel Project

Herschel1366

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

Herschel1367

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

Herschel1368

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

Herschel1369

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

Herschel1370

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

Herschel1371

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

Herschel1372

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

Herschel1373

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

Herschel1374

From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
28 January [1826?]
Source of text:
RS:HS 17.323
Summary:

Questions and comments regarding improvements in microscopy.

Contributor:
John Herschel Project

Herschel1375

From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[1826-1]
Source of text:
RS:HS 17.324
Summary:

Comments on several experiments with spectra passing through glass films.

Contributor:
John Herschel Project

Herschel14458

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

Herschel7549

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
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