From:
Sir John Herschel
To:
James David Forbes
Date:
1842-4-9[?]
Source of text:
St. Andrews 21? (C: RS:HS 22.115)
Summary:
Instructions for preparing liquid for the actinometer. Describes 'very strange' experiments on the spectrum as well as an 'unusual' cloud formation.
Contributor:
John Herschel Project