Search: Herschel, John in correspondent 
Selwyn, William in correspondent 
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1860-1869::1861::11 in date 
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Herschel2558

From:
William Selwyn
To:
Sir John Herschel
Date:
[20 November 1861]
Source of text:
RS:HS 15.567
Summary:

Sends series of solar heliographs. If further suggestions for improvement of these are noted, please send them. Is preparing to photograph Dec. 31 eclipse.

Contributor:
John Herschel Project

Herschel2559

From:
Sir John Herschel
To:
William Selwyn
Date:
[22 November 1861]
Source of text:
RS:HS 23.349
Summary:

Has no suggestions to improve photographs. Wants to determine whether the degradation of light from center to edge of sun is 'real.' Does not think sun's size affects focus.

Contributor:
John Herschel Project
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