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1840-1849::1848::06::28 in date 
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From:
Frederick W. Beechey
To:
Sir John Herschel
Date:
[28 June 1848]
Source of text:
RS:HS 4.20
Summary:

Thanks for his suggestions on the instrument, which E. A. L. Negretti is working on. Gives some more details of the instrument.

Contributor:
John Herschel Project