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From:
Sir John Herschel
To:
Georg Adolph Erman
Date:
[22 January 1871]
Source of text:
RS:HS 7.107
Summary:

Has sent a note to Nature stating the details of the grant paid by the B.A.A.S. to H. J. R. Petersen for magnetic observations.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Robert Ellis Dudgeon
Date:
[22 January 1871]
Source of text:
APS B.H435p.26 (C: RS:HS 24.348)
Summary:

Comments on use of 'air' lens rather than glass in some circumstances.

Contributor:
John Herschel Project