From:
Edward Sabine
To:
Sir John Herschel
Date:
22 July [1841?]
Source of text:
RS:HS 15.321
Summary:
Corrects information from an earlier letter. [John] Caldecott stated that diurnal curve of declination changed with monsoon at Trivandum. Discusses [William] Allen and observation with transportable magnetometer.
Contributor:
John Herschel Project