Is at present too ill to involve himself in any calculations necessary for making a good optical eyepiece.
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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.
Is at present too ill to involve himself in any calculations necessary for making a good optical eyepiece.
Thanks WH for informing JH of his son John being selected as a Council nominee for election to F.R.S.
Has despatched a letter on a subject of concern to JH to the editor of the Saturday News, but now feels it is too feeble. Is mostly feeling too ill to write or think for long.
Thanks TA for further information [see JH's 1871-2-22] on TA's work on ice calorimeter.
Is distressed to hear that [W. L.] Newman's tables cannot be found at the R.A.S. Please make a further search. Does the R.A.S. have C. J. G. [=J. W.] Pastorff's volume of drawings of sunspots?
Comments on several aspects of poetry; further comments on French/German relations [see JH's 1871-2-9 & 1871-3-22].
Encloses copy of JH's letter to R.A.S. [see JH's 1864-6-29] that accompanied JH's submission of W. L. Newman's tables for determining radii of aplanatic lenses. Suspects that there was more than one volume of tables.
Discusses WC's ideas on the causes of oceanic circulation. Notes that wind currents are easier to study than water currents. Glad WC got his specimens of Mediterranean water.