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.
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The Sir John Herschel Collection
The preparation of the print Calendar of the Correspondence of Sir John Herschel (Michael J. Crowe ed., David R. Dyck and James J. Kevin assoc. eds, Cambridge, England: Cambridge Univ. Press, 1998, viii + 828 pp) which was funded by the National Science Foundation, took ten years. It was accomplished by a team of seventeen professors, visiting scholars, graduate students, advanced undergraduates, and staff working at the University of Notre Dame.
The first online version of Calendar was created in 2009 by Dr Marvin Bolt and Steven Lucy, working at the Webster Institute of the Adler Planetarium, and it is that data that has now been reformatted for incorporation into Ɛpsilon.
Further information about Herschel, his correspondence, and the editorial method is available online here: http://historydb.adlerplanetarium.org/herschel/?p=intro
No texts of Herschel’s letters are currently available through Ɛpsilon.
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.
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.
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.
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.
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.