Search: Herschel, John in correspondent 
Talbot, William Henry Fox in correspondent 
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letter in document-type 
Herschel, John in addressee 
1840-1849::1843 in date 
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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
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
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