JH writes to the best of his knowledge about William Mann's competence in various areas.
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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.
JH writes to the best of his knowledge about William Mann's competence in various areas.
Urges renewal of high balloon ascents with periodic observations both to further knowledge of law of decrement of temperature and pressure and for 'ulterior investigations.'
Notes that actinometer observations prove faulty due to problem with instruments. Asks that WS notify Indian observatories to join others in terminating such observations until JH finds method of getting around problem.
Thanks WS for offer of professorship of astronomy at Oxford, but declines it, partly because of other pursuits and health reasons, and considers his astronomical career terminated.
Stresses importance for Balloon Committee of obtaining corresponding temperatures and pressures; describes two highly sensitive thermometers that might be built for this purpose.
Interprets [John] Dalton's theory of the nonelasticity of gas particles, expressing its limitations, particularly in regard to a Mr. Paton's paper.
Suggests course of action regarding 'Gen'l. Cullen's [?]' hydrometric observations submitted to R.S.L.