Search: Herschel, John in correspondent 
Selwyn, William in correspondent 
1860-1869::1862::10 in date 
letter in document-type 
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Herschel2563

From:
Sir John Herschel
To:
William Selwyn
Date:
[16 October 1862]
Source of text:
RS:HS 15.471 (C: RS:HS 23.389)
Summary:

Has photographs of September 23 . Desires half pictures 'with the sun's limb in the middle of the view.' Cannot yet draw conclusions about the notches of the limb.

Contributor:
John Herschel Project

Herschel2562

From:
William Selwyn
To:
Sir John Herschel
Date:
[8 October 1862]
Source of text:
RS:HS 15.470
Summary:

Discusses problems with darkness on solar autographs and also the appearance of a white spot or 'ghost.' Cannot explain the 'notch' in the Aug. 4 autographs.

Contributor:
John Herschel Project

Herschel2564

From:
William Selwyn
To:
Sir John Herschel
Date:
[18 October 1862]
Source of text:
RS:HS 15.472
Summary:

Will send requested half pictures. Notes that the 'ghost' always appears in the center of the plate. Discusses position lines and notches.

Contributor:
John Herschel Project
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