Requesting information of the dispersion of rays in Crown and Flint glass.
Showing 1–20 of 37 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.
Requesting information of the dispersion of rays in Crown and Flint glass.
Sends GA information about indices of refraction in different glasses and in different parts of the spectrum; also recommends the writings of Josef Fraunhofer.
Concerning calculations for the parallax of Mars.
Description of theory of a telescope, though not practical yet.
Asking for introductions to certain men of science in Paris. Revision of his views on his figure of the earth, and casting doubt on Edward Sabine's pendulum observations.
Writes to urge GA to avail himself of the opportunity of working with Basil Hall in swinging the pendulum at Greenwich; concludes with a note for William Whewell about JH's view of the 'extremely irregular' figure of the earth.
Sending his paper on the 'Figure of the Earth.' Description of work at Greenwich Observatory. Remarks on projected expedition to Falmouth and Ashbourne.
Instructions regarding the printing of his paper the 'Figure of the Earth' in the transactions. Details of the disappointing expedition to Falmouth.
Comments on GA's observing in Cornwall, and on the geodetic calculations made by GA in a paper read by JH.
Thanking him for his letters of introduction to Paris. Remarks on one of GA's papers; one of his calculations incorrect.
A letter of introduction for a Mr. Thomson, who intends to go to South America and establish schools, and wishes to talk to GA about university education.
Comments on a paper on achromatic eyeglasses submitted by GA to the R.S.L.; also on a paper of William Whewell's on the operation of a pendulum.
Information on a Mr. Atkinson. Remarks on dispersion of rays in glass.
Asking for the procedure for bringing business before the Board of Longitude. Has found solar tables incorrect.
Talks at length about the operation of the Board of Longitude and of procedures GA should know if he wishes to present proposals to the Board; JH seems to be trying to calm down GA.
Requesting permission to borrow Christiaan Huygens's telescope. Postscript of further remarks on the solar tables.
Asks GA about the purpose of the request for the use of Christiaan Huygens's telescope in the possession of the R.S.L.; JH comments on the accuracy of James South's astronomical observations.
Giving his reasons for wanting to borrow Christiaan Huygens's telescope. Postscript on recent observations with a prism.
A letter accompanying several other letters that might be of interest to GA; encourages GA to act quickly if he means to try for 'the appointment.'
Questions concerning a vacant professorship at Dublin Observatory.