From:
William Henry Fox Talbot
To:
Sir John Herschel
Date:
[28 January 1839]
Source of text:
RS:HS 17.278
Summary:
JH is indisposed, so WT will come to Slough to review paper [see WT's 1839-1-25]. Asks JH about appropriate curve on lenses for camera obscura for 2-foot focus.
Contributor:
John Herschel Project