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.
Claims if he had known certain informations concerning discovery of Neptune, he would have ranked J. C. Adams's claim equal with U. J. J. Leverrier's.
Received JH's letter and enclosure of yesterday. Gave instructions to refuse newspapers arriving for JH without postage from Cape of Good Hope.
On the usefulness of Stephen's Writing Fluid to stop the sun's excess of light at large apertures in the telescope.
Asks JH's opinion of placement of some of William Herschel's documents. Agrees with JH on Neptune case, although he claims to have difficulty formulating an argument.
Sends a lithograph of the 4-ft. aperture equatorial. Has made no observations with it yet. Had difficulty with the surface of the speculum. Comments on the drawing and on the use of the instrument. Cannot recollect seeing any of the irregularities pointed out by JH in his letter.
Would like a letter from JH supporting him against the charge of incompetency in his editing of the Photographic News.
Asks JH's opinion of a tuning fork design; includes plan of the instrument.
Is sending pamphlet which he hopes will persuade Aberdeen University authorities to retain the chair of Natural Philosophy. Would like JH's comments on this.
Comments on WL's 4-foot equatorial telescope of which WL sent JH a lithograph [see WL's 1860-2-8].
Thanks JH for advice on tuning fork. Further enquires about the instrument.
Pointing out the reasons for some apparent discrepancies in the drawing of his telescope. The drawing was hurriedly done by his daughter.
Is asking JH for assistance.
Thanks for signing his certificate for the R.S.L. Has promise of support from members of Council. Has just contrived a new ozone box; gives details. Carrying out observations with underground thermometers.
Sends published paper containing GY's proof that roots of algebraic equations above fourth degree cannot be represented by finite functions, and showing how roots of fifth degree equations may be found. GY's method may be extended to all higher degrees.
A follow-up letter [see BB's 1860-2-14] asking for an immediate response to BB's request for money.
Is grateful for the help JH's letter gave him in his legal dispute with the Photographic News.
Has a foreigner staying at his house. Has seen letter by this man addressed to JH. TR wants to know if the foreigner is respectable. Thinks his name is [B.] Birkenthal.
Sends his personal scientific journal to JH. Charles Babbage has already given JS much help.
Regarding the sun's equation. Sun spots.