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1840-1849::1849::04::21 in date 
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From:
Francis Beaufort
To:
Sir John Herschel
Date:
[21 April 1849]
Source of text:
Hydrographic Office Letter Book
Summary:

Identifies the positive features of the aneroid barometer as in use by the Navy.

Contributor:
John Herschel Project
From:
Robert Hunt
To:
Sir John Herschel
Date:
[21 April 1849]
Source of text:
RS:HS 10.130 & 10.136
Summary:

Is thinking of withdrawing his son from Christ's Hospital owing to his frequent epileptic fits. Should he inform the Prince Consort? Outlines his recent photographic work.

Contributor:
John Herschel Project