Remarks on the significant increase in brightness of the star Eta Cygni, and comments on several other variable stars.
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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.
Remarks on the significant increase in brightness of the star Eta Cygni, and comments on several other variable stars.
Urges some revision in both the report and instructions for the magnetic observations.
Birth of JH's ninth child [Julia].
Writes to the Chancellor of the Exchequer to give JH's opinion about the probable utility of continuing to spend money on Charles Babbage's calculating machine.
Informs BT of the birth of JH's daughter Julia. Mother and child are both doing well.
About eclipse observations of 1842, together with JH's speculations about the existence of an atmosphere around the sun. Enclosed is an eclipse drawing by Francis Baily.
Reports the erection of an obelisk at Feldhausen to commemorate the site of JH's 20-ft. reflector. Back at Cape Town, Thomas Maclear is measuring N. L. Lacaille's Arc of the Meridian. JH received the Prussian Order of Merit.
Thanks for RH's paper on mineralogy. JH has explored use of mercury together with iron in photography.
Reports the birth of JH's ninth child, Julia.
Needs some clarification of GA's letter [see GA's 1842-9-16] before JH is ready to reply about the calculating engine.
Reply to GA's letter on Charles Babbage's calculating machine.
Gives GA some accounting of standard weights in Britain, and feels that it would be worth acquiring Robinson estate weight [see GA's 1842-9-22].
Has sent the papers on the eclipse to G. B. Airy.
Does not feel qualified to judge the merits of the various makes of telescopes. Suggests that the Astronomer Royal may be able to help or one of the other observatories.
Must complete graphs of barometer curves before B.A.A.S. meeting. Did JH mistakenly include 1837 Bogota Almanac in barometer observations?
Sends two dozen more papers on barometer graphs. Must have all papers on subject by January. Pleased with WB's lunar observations.
The instructions for making magnetic and meteorological observations are to be revised. JH asks CG's advice about this.
Calls attention to the increase in magnitude of the star Eta Cygni. Mentions some other variable stars.
Congratulates WW on a testimonial held in WW's honor in Lancaster. Reports the birth of JH's sixth daughter [Julia].