Search: 1870-1879 in date 
Herschel, John in author 
Selwyn, William in addressee 
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Showing 17 of 7 items

From:
Sir John Herschel
To:
William Selwyn
Date:
[23 April 1870]
Source of text:
RS:HS 24.304
Summary:

Asks whether WS has photographs of the sun for 21 and 22 April. Notes how curious sunspot activity has been. Doubts that such is reconcilable with the notion of 'meteoric in-falls.'

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Selwyn
Date:
[30 April 1870]
Source of text:
RS:HS 24.309
Summary:

Is returning March heliographs. Discusses the appearance of the spots. Has not received the April heliographs.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Selwyn
Date:
[2 May 1870]
Source of text:
RS:HS 24.310
Summary:

Wants to compare Mr. Titterton's photographs of the spot groups to [Warren] de La Rue's. Has tried to determine if some localities regularly have spots.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Selwyn
Date:
[12 May 1870]
Source of text:
RS:HS 24.313
Summary:

The research shows no particularly 'maculiferous' area on the sun, but WS may, as WS requested, present 'data' to the R.A.S. Has noticed two new spots on helioautographs on 20 and 27 April.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Selwyn
Date:
[17 June 1870]
Source of text:
RS:HS 24.320
Summary:

Sends diagrams showing three new couplets of sunspots. The sun is entering a new phase of activity. Sends drawings made with a glass pen by his son Alexander.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Selwyn
Date:
[31 August 1870]
Source of text:
RS:HS 24.329
Summary:

Discusses the movement of the 'great group' of sunspots over the last six months. Asks WS to sign a certificate for his son [John].

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
William Selwyn
Date:
[4 September 1870]
Source of text:
RS:HS 24.330
Summary:

Thanks WS for August 29 photographs. Is sending JH's son's [John's] certificate. Pities the 'fallen Emperor' [Napoleon III].

Contributor:
John Herschel Project