Showing 81–100 of 332 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.
Enlarging on the luminous phenomena he has seen in the S.W. and giving some comments from a naval officer who had observed it.
Reports where to observe the comet [Great Comet of 1843], its head having now become visible.
Describes observing of comet that evening.
Accepts his invitation to visit him in order to discuss various matters.
Some comments about photographic processes and about RH's observations of the heavens [see RH's 1843-3-24].
Comments on confusion between observing comet and zodiacal light. Extensive comments on various materials used in a photographic process where negatives change to positives over long time.
Newspaper noted Caroline Herschel's 93rd birthday. Requests copy of William Herschel's portrait. Gives address of London relative, Charles Stonhouse, who can copy it. Would JH sit for portrait there also? What did JH decide about 'our comet'?
Official acknowlegement of JH's work on photographic reproduction.
Suggests 'amphitype' as name for JH's process whereby same picture can go from negative to positive. Further comments on comet sighting, and on some improvements to Daguerreotype.
Sending a letter he has received from a friend regarding a curious observation of the moon. Has seen the comet and encloses diagrams of its position.
Argues against the view that what JH has taken to be the tail of a comet [Great Comet of 1843] is actually due to the zodiacal light.
Zodiacal light is a real phenomenon. Further comments on negative to positive process. Questions whether WT can define one cometary orbit with two observations.
Describes the visit of the Crown Prince and Princess [of Hanover?] on her 93rd birthday (16 March).
Has copied out JH's map showing the constellations as named by JH. Is moving to Richmond for a few weeks. Gives a message from H. C. Schumacher.
Sends along Frederik Kaiser's observations of Halley's Comet; [Robert] Everest is upset with JH because JH had signed a letter of support for a grant for T. B. Jervis.
Has just received the news that Hartnell's son has passed the exams at Trinity College, Cambridge.
Sending readings from his observations of the comet.
Comments on JH's positive calotype. Suggests comet may be return of (J.-D.) Cassini's comet of 1668. Gives theorem for finding parabolic orbit of comet if two observations are made in the ecliptic.
Sends a paper of his brother, Christopher Kemplay, on a theory respecting comets. Has already submitted it to James Challis, who objects to some points. Would be glad of JH's comments.
Invites JH to 10 May anniversary dinner of Literary Fund Society.