Search: Herschel, John in correspondent 
Selwyn, William in author 
1860-1869::1862 in date 
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Herschel2560

From:
William Selwyn
To:
Sir John Herschel
Date:
[11 January 1862]
Source of text:
RS:HS 15.468
Summary:

Discusses a depression on a heliograph, which he cannot reconcile with [Frederick] Howlett's observations. Conjectures over-exposure in printing may be the culprit.

Contributor:
John Herschel Project

Herschel2561

From:
William Selwyn
To:
Sir John Herschel
Date:
[12 August 1862]
Source of text:
RS:HS 15.469
Summary:

Sending autographs. Discusses the faculae on the eastern limb and the reception of JH's note at the R.A.S. [Frederick] Howlett is drawing a group of sunspots.

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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