From:
[Mario Gemmellaro]
To:
Sir John Herschel
Date:
[3 November 1827]
Source of text:
TxU:H/M-0399; Reel 1087
Summary:
Awaits JH's instructions on duplicating barometer observations taken at Mt. Etna. Francesco Lunn visits, will verify observations made by MG. MG congratulates JH on the success of his efforts to measure the brightness of light with precision.
Contributor:
John Herschel Project