From:
Sir John Herschel
To:
Humphrey Lloyd
Date:
1840-6-[25 or earlie
Source of text:
RS:HS 25.14.19
Summary:
Sends to HL a sheet of curves laid down by [Charles] Riddell, comparing Brussels declination observations with those made in Toronto. JH frequently refers to HL's work on the subject of terrestrial magnetism.
Contributor:
John Herschel Project