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Birt, William Radcliffe in correspondent 
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Herschel, John in addressee 
1840-1849::1843::09 in date 
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From:
William Radcliffe Birt
To:
Sir John Herschel
Date:
[12 September 1843]
Source of text:
RS:HS 4.103
Summary:

Could he loan him the Russian observations. Recent readings of the barometer.

Contributor:
John Herschel Project
From:
William Radcliffe Birt
To:
Sir John Herschel
Date:
[20 September 1843]
Source of text:
RS:HS 4.104
Summary:

Thanks for letter and loan of the books. Regarding the movement of waves of the atmosphere.

Contributor:
John Herschel Project