From:
Sir John Herschel
To:
Edward Sabine
Date:
[20 December 1860]
Source of text:
RS:HS 23.322
Summary:
Thanks for declination readings from photograms at Kew. Thinks meteorological observatory on Vesuvius is good idea, but not sure a magnetic one is. Includes two charts of world.
Contributor:
John Herschel Project