Search: Herschel, John in correspondent 
Selwyn, William in author 
1860-1869::1861 in date 
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Herschel2719

From:
William Selwyn
To:
Sir John Herschel
Date:
[1861]
Source of text:
RS:HS 15.515
Summary:

Detached postscript discussing sunspots, comparing them to the low barometric pressure center in cyclones. J. S. Henslow is dying.

Contributor:
John Herschel Project

Herschel2556

From:
William Selwyn
To:
Sir John Herschel
Date:
[19 March 1861]
Source of text:
RS:HS 15.465
Summary:

Discusses 'autograph of the sun' he sent earlier. Discusses measuring relative temperature of sun. Has an unpublished letter of Galileo to Cardinal Barberini regarding sunspots.

Contributor:
John Herschel Project

Herschel2557

From:
William Selwyn
To:
Sir John Herschel
Date:
[27 April 1861]
Source of text:
RS:HS 15.466
Summary:

Discusses Galileo's unpublished letter on sunspots. Outlines comparisons between tropical storms and sunspots as discussed at Cambridge Philosophical Society. Wishes to meet [Frederick] Howlett to discuss sunspots.

Contributor:
John Herschel Project

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
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