Regarding electrometers and their efficiency.
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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 electrometers and their efficiency.
Further regarding glass for telescope. Postscript relating experiments with electricity.
Has JH received Thomas Maclear's observations on Encke's comet?
Has not heard from Thomas Maclear [see GA's 1844-3-12]; has the Cape equatorial object glass been dealt with?
Comments on the large number of stars identified in one square degree of sky.
Regarding Cape Town telescopes. Has written to Thomas Maclear for observations on Encke's comet.
Regarding JH's forthcoming visit to the Greenwich Observatory.
Whether a repulsive force from the sun affects the tails of comets and thus the constancy of their orbits.
Arrangements about attending a meeting, together with some thoughts on the behavior of comets.
Regarding object glasses for telescopes. Relative merits of Munich and French object glasses.
Further observations on object glasses.
Will try to organize an international magnetic conference at the B.A.A.S. meeting in 1845, if GA agrees.
Does not believe that a magnetic congress held at this time would be productive or representative; a better job could be done by letter.
About a suggested magnetism conference, Francis Baily's illness, and some remarkable observations by F. W. Bessel.
Cannot explain why GA's letter did not reach JH.
Informing JH that he certainly wrote to him from Limerick.
Regarding F. W. Bessel's letter on the irregularity of proper motion in stars. Is it worth printing Nevil Maskelyne's observations on star places?
Urges GA to print any of John Pond's and Nevil Maskelyne's observations that seem free from serious error [see GA's 1844-8-28].
Expands on GA's proposed letter writing scheme in place of holding a magnetic congress [see GA's 1844-7-30].
A note accompanying a draft of the report on magnetic observations to date at British stations, and a circular to be sent out.