From:
Augusta Ada King
To:
Sir John Herschel
Date:
12 October [1848]
Source of text:
RS:HS 19.284
Summary:
Quotes passage from A. E. P. Gasparin comparing JH's actinometer to other such instruments. Seeks JH's opinion of Adolphe Quetelet's hypothesis of heat. Question on photographic chemicals and 'calorific rays.'
Contributor:
John Herschel Project