Search: Herschel, John in correspondent 
Smyth, William Henry in correspondent 
1830-1839::1839::04::28 in date 
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From:
Sir John Herschel
To:
William Henry Smyth
Date:
[28 April 1839]
Source of text:
APS B.Sm98.17 (C: RS:HS 22.13)
Summary:

Does not have operational telescope. Suggests WS set 1840 as epoch.

Contributor:
John Herschel Project