From:
Adolphe Quetelet
To:
Sir John Herschel
Date:
[19 January 1841]
Source of text:
RS:HS 14.221
Summary:
Says JH's interest in AQ's work has been source of motivation. Notes that on 21 September and 21 December, aurora borealis and magnetic perturbations have been spotted. Asks where to procure an actinometer in England.
Contributor:
John Herschel Project