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From:
Thomas Henderson
To:
Sir John Herschel
Date:
[5 April 1843]
Source of text:
RS:HS 9.303
Summary:

Sending readings from his observations of the comet.

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