Appreciates the difference between Robert Hooke's and JH's suggestions for a helioscopic telescope. Comments on these suggestions. Has recently constructed a reflecting prism. Comments on this.
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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.
Appreciates the difference between Robert Hooke's and JH's suggestions for a helioscopic telescope. Comments on these suggestions. Has recently constructed a reflecting prism. Comments on this.
Was not the person who sent him some photographs of the sun. Was glad the Astronomical Soiree was well spoken of. James Nasmyth was conspicuous and is pleased he was mentioned in JH's Outlines Astr.
Encloses a letter from William Simms, which contains a suggestion for JH's reflecting prism. Inclines to the view that a reflector is not the most suitable instrument for sun observations.
Sending the tracing again with a few additions. Comments on this and the one sent yesterday.