Regarding modifications to the water eye piece of his telescope.
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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.
Regarding modifications to the water eye piece of his telescope.
Disappointed that EC could not visit Collingwood in February while in Tunbridge Wells to visit daughter, Mrs. Arthur Warre. Leaving for London to see Exhibition.
Will send records of cometic nebulae EC found in Nice during winter of 1844-1845. These did not appear in JH's catalogue. Does JH have all nebulae found by William Parsons?
Sending sketches of nebulae made in Nice and Naples in 1843-1845 using K. L. Harding's maps. Please return them.