From:
George C. Hodgkinson
To:
Sir John Herschel
Date:
[10 June 1863]
Source of text:
RS:HS 9.416
Summary:
Thanks for the information. Has written to Henry Barrow, and to Negretti and Zambra. The latter can supply actinometers for 14 guineas; too expensive for him. Barrow has just replied that he can supply for 6 guineas.
Contributor:
John Herschel Project