Search: Herschel, John in correspondent 
Schaffheütl, Karl Emil in correspondent 
Herschel, John in addressee 
letter in document-type 
1840-1849 in date 
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From:
Karl Emil Schaffheütl
To:
Sir John Herschel
Date:
[15 May 1845]
Source of text:
RS:HS 17.172
Summary:

Updates and requests opinion on KS's newly devised 'universal photometer.'

Contributor:
John Herschel Project