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From:
Charles Babbage
To:
Sir John Herschel
Date:
[6 March 1819]
Source of text:
RS:HS 2.114
Summary:

Has dispatched the tourmaline. His chemical experiments. Circulating functions solving chance problems. [Letter postmarked 1819-3-29.]

Contributor:
John Herschel Project
From:
Charles Babbage
To:
Sir John Herschel
Date:
[21 March 1819]
Source of text:
RS:HS 2.112
Summary:

Has had some more tourmaline sent. Gives some more equations. Chemical experiments.

Contributor:
John Herschel Project
From:
Robert Grahame, Sr.
To:
Sir John Herschel
Date:
[25 March 1819]
Source of text:
RS:HS 9.1
Summary:

Unable to come to dinner on Saturday but hopes to see him in the evening.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Charles Babbage
Date:
[25 March 1819]
Source of text:
TxU:H/L-0051.4; Reel 1054
Summary:

Made apparatus for showing rings between 'two Tourmalines.' JH's process for making hyposulfurous acid. Praises W. H. Wollaston's analysis of CB's 'Tonquinate.'

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Charles Babbage
Date:
[25 March 1819]
Source of text:
RS:HS 2.113 (C: RS:HS 20.68)
Summary:

Regarding the disposal of the tourmaline. Address of his cousin. Drawing and description of the apparatus for experiments on tourmaline. Chemical experiments.

Contributor:
John Herschel Project