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Perigal, Henry in correspondent 
1830-1839 in date 
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Herschel12498

From:
Henry Perigal
To:
Sir John Herschel
Date:
[6 May 1839]
Source of text:
RS:HS 13.364
Summary:

A note accompanying some machine-made mathematical curves.

Contributor:
John Herschel Project

Herschel12499

From:
Henry Perigal
To:
Sir John Herschel
Date:
[17 August 1839]
Source of text:
RS:HS 13.365
Summary:

More mathematical curves made by machine [see HP's 1839-5-6].

Contributor:
John Herschel Project
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