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John Herschel Project in contributor 
1840-1849::1842::09 in date 
[Birt, William Radcliffe] in addressee 
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From:
Sir John Herschel
To:
[William Radcliffe Birt]
Date:
[22 September 1842]
Source of text:
RS:HS 19.97
Summary:

Must complete graphs of barometer curves before B.A.A.S. meeting. Did JH mistakenly include 1837 Bogota Almanac in barometer observations?

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
[William Radcliffe Birt]
Date:
[26 September 1842]
Source of text:
RS:HS 19.98
Summary:

Sends two dozen more papers on barometer graphs. Must have all papers on subject by January. Pleased with WB's lunar observations.

Contributor:
John Herschel Project