Thanks JH for introducing WR's paper on photometer to R.S.L. council. Sends drawing of instrument and alterations to WR's paper that resulted from improvements in instrument.
Showing 21–40 of 183 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.
Thanks JH for introducing WR's paper on photometer to R.S.L. council. Sends drawing of instrument and alterations to WR's paper that resulted from improvements in instrument.
Suggested improvements to John Leslie's photometer.
Outlining his Italian travels after leaving Naples. Had to return home as business pressed.
Comments on a variety of topics about various scientific persons on the Continent, on JH's travels in Europe, on ways to send packets between England and Europe, and on FZ's copy of the Nautical Almanac, which FZ has not yet received. Makes comparisons between his and JH's barometer, offers some comet observations, and talks about the appropriate date for Easter. Awaits JH's double star observations.
Sends drawings associated with WW's paper and passed by [R.S.L.] Council for printing, and memoir from M. A. Pictet.
Giving details of Giuseppe Bianchi's barometer. Regarding the experiments of Leopoldo Nobili on the electrization of mercury. Gives tables of star observations.
About lodgings in London [see JG's 1824-12-31], JG's writing, and his 'love affairs.'
Regarding his own experiments with revolving balls.
Will present alterations of WR's paper to R.S.L. [see JH's 1825-1-27]. Asks if he may describe the similarities between WR's photometer and an instrument JH used in Italy and Sicily.
More about lodgings in London [see JG's 1825-2-14], and about books JG and JH have read [letter completed 1825-3-9].
Reports on some observations from JS's observatory near Paris and on his contacts with the Paris Observatory. Relays to JH a request from Alexander von Humboldt for barometric observations. Invites JH to visit.
Has recently discovered in Cumberland a rich vein of cobalt, which is mixed with iron. Would like his opinion whether these ores can be easily separated. Can send him a specimen if required.
Would like to borrow the drawing of Josef Fraunhofer's telescope. Has received an account of this telescope from Wilhelm Struve, which he is now translating. Regarding the miscarriage of the Memoirs for Struve.
Forwards a specimen of his cobalt. Gives price and the various methods of use and refining. Thinks the analysis did not show its true qualities. Would like to hear the results of JH's experiments.
Pleased JH liked his paper on differential photometer. Discusses apparatus for experiments on light. Describes some papers he has written and some he is writing.
Edward Sabine's and JH's memoir on the differences of the meridian between Greenwich and Paris. Hopes to print a notice of the same operation with similar results. Operations last year between Paris and Brest were not a success so hopes to repeat them this year.
Wishes JH a happy birthday. Finished the catalogue of 2500 nebulae.
Thanks for information on the R.S.L. barometers. Would he purchase various instruments for the new observatory. Notes on star readings.
Making, reducing, and publishing double star work is very difficult and, because of Wilhelm Struve's recent endeavors, less pressing than it had been. Mentions various doubles. Expresses interest in JS's plan to purchase a very large refractor.
Comments on ES's measurement [in his Account of Experiments to Determine the Figure of the Earth] indicating 'the increase of the fraction expressing the earth's compression.' Predicts that ES's result will cause a 'sensation,' but does not commit himself to it.