Recommends buying optics for 7.5-inch telescope from Metz and Mahlers in Munich and having those mounted in London.
Showing 1–20 of 42 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.
Recommends buying optics for 7.5-inch telescope from Metz and Mahlers in Munich and having those mounted in London.
Has received a request from the Admiralty to order a new telescope for the Cape observatory; at the same time, JH has received an unsolicited offer of a lens. JH seeks advice and information from GA.
Urges doubling number of lunar observations.
Tells GA about a new comet becoming visible.
Agenda items for next meeting of 'Committee for Superintending the Construction of Standards.' Compares English, French, Danish, and Prussian standards.
Gives formula for defining the measure of the scale of an actinometer.
A new committee on standards is to be created to oversee the preparation and measuring of appropriate standard measures; seeks JH's opinion about asking Francis Baily and W. H. Miller to do the accurate weighing and measuring.
A notice of meeting of the Standards Committee.
Provides JH with the measurements from a series of observations of Gamma Virginis.
Provides JH with information and advice about large lenses, which JH is considering for a Cape of Good Hope Observatory equatorial telescope.
Describes some available glass discs, which might do for making lenses for a large refracting telescope [see GA's 1843-8-30].
A notice of meeting of the Standards Committee, together with an indication of business to be conducted at that meeting.
Needs a good artisan to construct the framework of a solar spectrum photographic apparatus.
Would support improvements, both in number and quality, of lunar observations at the Royal Observatory; current practices produce unacceptably large predictive errors.
Changes the date of a Board of Visitors' meeting and urges JH to be there.
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.
Sending copy of GA's 'Tides and Waves' for Encyclopaedia Metropolitana; would be glad of JH's comments. Also encloses his eclipse paper.
Answer to one of JH's on 9 January [apparently on equatorial telescopes].
Regarding William Cubitt (Engineer of the Dover Railway) and the proposed blasting down of the cliffs between Dover and Folkestone.
Further news of his proposed visit to Dover to see the blasting of the cliffs?