From:
Robert Hunt
To:
Sir John Herschel
Date:
[21 November 1842]
Source of text:
RS:HS 10.94
Summary:
Was pleased to receive JH's letter and to read that he had really proved the existence of [invisible light?]. One of his students has produced images on copper plates by sulfur fumes. Has just seen Macedoine Melloni's memoir, which is now governed by JH's views.
Contributor:
John Herschel Project