Sends GA a spectrum photograph, and explains how JH obtained it.
Showing 81–100 of 166 items
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.
Sends GA a spectrum photograph, and explains how JH obtained it.
Sends GA two more spectrum photographs [see JH's 1842-4-10], and believes that these may lead the way to color photography.
Provides the best values available for dispersion and separation, which will allow GA to calculate what he needs [see GA's 1845-4-4].
Asks a number of questions that need answers before considering the purchase of a large new telescope for the Royal Observatory.
Thanks GA for his contributions to some material JH is compiling; asks about date of Board of Visitors meeting.
Thinks the building changes proposed [see GA's 1848-1-21] are fine; explains JH's position on the whole matter.
JH begs to differ with GA and Isaac Newton on the moon's motions [see GA's 1848-10-13]; warns GA against accepting J. H. Seyffert's work as accurate.
Surprised by GA's unhappiness with George Merz [see GA's 1848-2-17]; suggests GA seek information from Thomas Maclear at the Cape, who is getting a new telescope from George Merz.
Willing to let GA choose the best objective lens [see GA's 1848-4-5]; then JH offers another possibility; all are ill at Collingwood.
Further to resolving the time conflict [see GA's 1847-5-15] and sending out invitations for Visitation Day.
Gives GA an address for the next while, and tells GA what JH has done about invitations for Visitation Day [see JH's 1847-5-19].
Clarifies the agenda for the next R.A.S. meeting, and reports that the large refracting telescope is on the way to the Cape.
Is aware of T. J. Hussey's drawings [see GA's 1848-2-1]; needs information about P. A. Hansen's lunar theory for an appreciation JH is to provide.
Personally would like to have F. W. A. Argelander's work printed [see GA's 1848-9-13], but will need to get a wider opinion; also asks about sharing money available from the Admiralty [see GA's 1845-10-24].
Still arguing that Isaac Newton is not correct concerning the moon's motions [see GA's 1848-10-24].
Is skeptical of the American observations [see GA's 1845-12-8], and reports other observations communicated to JH.
About family health; JH's star counting has led him to believe that all stars are part of one sidereal system [the Milky Way].
Will send measurements of the requested stars [see GA's 1847-5-15] as soon as JH can consult the appropriate papers.
Provides the measurements for Beta Aquarius and Alpha 2 Capricorni [see JH's 1847-5-23].
Finds GA's measurements of Gamma Virginis far away from JH's own, and instructs GA in the best way to measure double star positions.