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Beaufort, Francis in author 
1840-1849::1849::04 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
Document type
Transcription available