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1840-1849::1840::01 in date 
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Herschel14181

From:
Sir John Herschel
To:
Unidentified
Date:
[1840 to 1841]
Source of text:
TxU:H/M-0407.2; Reel 1087
Summary:

Note on diurnal changes in [magnetic] variation at St. Helena and on estimated cost (£950) of observatory at St. Helena.

Contributor:
John Herschel Project
Author
Addressee
Correspondent
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Transcription available