From:
Alexander Wight, Jr.
To:
Sir John Herschel
Date:
[28 March 1856]
Source of text:
RS:HS 18.245
Summary:
New method for constructing circular lenses up to 10-feet diameter for £50. Focusing power sufficient to melt metals. Wants to send 3-inch sample to JH.
Contributor:
John Herschel Project