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Howlett, Frederick in correspondent 
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From:
Sir John Herschel
To:
Frederick Howlett
Date:
[24 April 1870]
Source of text:
RS:HS 24.306
Summary:

Writes to compare notes on sunspot observations.

Contributor:
John Herschel Project
From:
Frederick Howlett
To:
Sir John Herschel
Date:
[28 April 1870]
Source of text:
RS:HS 10.23
Summary:

Has no idea whether the sunspots appeared suddenly or gradually. The Kew people may be able to help in this matter. Comments on some more sunspots.

Contributor:
John Herschel Project
From:
Frederick Howlett
To:
Sir John Herschel
Date:
[25 August 1870]
Source of text:
RS:HS 10.24
Summary:

Intends bringing the subject of sunspots before the B.A.A.S. next September and would therefore like JH's views on whether in his opinion these spots are mechanical or magnetic. Also any other comments would be welcome.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Frederick Howlett
Date:
[29 August 1870]
Source of text:
Adler Ms. 13 (C: RS:HS 24.328)
Summary:

Comments on remarkable solar activity. JH admits he has no theory to explain sunspots.

Contributor:
John Herschel Project
From:
Frederick Howlett
To:
Sir John Herschel
Date:
[7 September 1870]
Source of text:
RS:HS 10.25
Summary:

Is grateful for JH's note. Agrees with him about the mystery of the sunspots. Is awaiting some heliographs from Ely. Is inquiring from Kew as to any recent magnetic disturbances that may coincide with the appearance of the sunspots. Is grateful for Alexander Hershel's information.

Contributor:
John Herschel Project
From:
Frederick Howlett
To:
Sir John Herschel
Date:
[5 April 1871]
Source of text:
RS:HS 10.26
Summary:

Is anxious to have an astronomical eye-piece based on JH's principles. Encloses communication from Messrs. Horne and Thornthwaite, who would like details for their employee, [W.?] Ackland, to work from.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Frederick Howlett
Date:
[7 April 1871]
Source of text:
RS:HS 24.361
Summary:

Is at present too ill to involve himself in any calculations necessary for making a good optical eyepiece.

Contributor:
John Herschel Project
From:
Frederick Howlett
To:
Sir John Herschel
Date:
[10 April 1871]
Source of text:
RS:HS 10.27
Summary:

Is grateful for his reply. Hopes he is feeling better. Escaped worst of the winter by expedition to Algeria, though the results were disappointing. Comments on some of his observations. Feels sure [W.?] Ackland will be able to construct a suitable eyepiece.

Contributor:
John Herschel Project
From:
Charles Robert Darwin
To:
Frederick Howlett
Date:
21 Sept [1878]
Source of text:
William Patrick Watson (dealer) (catalogue 22, January 2018, item 20)
Summary:

Cannot explain the peculiarities of the blood corpuscles of the Camelidae; maybe similarity between camels and ostriches arises from adaptation rather than common ancestry.

Contributor:
Darwin Correspondence Project