Claims himself perfect case of di-chromic vision, only seeing blue and yellow. Gave paper on his condition to R.S.L., quoting and supporting JH's theory. Hears JH is ill, or would send letter directly to JH.
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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.
Claims himself perfect case of di-chromic vision, only seeing blue and yellow. Gave paper on his condition to R.S.L., quoting and supporting JH's theory. Hears JH is ill, or would send letter directly to JH.
Thanks JH for his note. States R.S.L. is sending his paper to JH as a referee. Gives details of his own case of di-chromic vision.
Gives particulars of his vision, which WP characterizes as di-chromic. Recounts experiments with red glass sent by JH to WP. Offers to visit if JH wants personal interview.
Thanks JH for note explaining colored glasses and 'positive' colors, saying WP only had a chance to do experiments with 'negative' colors thus far. Accepts JH's invitation to visit.
Explains why his paper on color vision took the artist, dyer, etc., point of view rather than that of scientific chromatology. Willing to investigate a more scientific approach and asks permission for another visit.
Plans to visit JH next week [to discuss color blindness].
Will bring [M. E.] Chevreul's color diagrams and new spectrum representation when he visits JH; confirms mode and date of arrival.
Thanks Herschels for their hospitality and tells about layers of volcanic ash encountered on a walk.
Describes, using a diagram, how the solar protuberances appeared to him as a color-blind person when he observed a solar eclipse.
Thanks for note of 29 [July]. Expresses doubt over accuracy of his observations of a solar eclipse. Stresses the necessity of careful comparison of various observations. Asks JH's opinion of a photograph with prominences greater and corona less than supposed.
Sends his certificate for the R.S.L. to JH to sign.
Thanks JH for his note. Asks that JH's paper on scales [1868 'On Musical Scales'] be made available to him.
Notices in letter of last May JH's postscript about the rate of color blindness occurring to overworked or ill artists, and doubts it becomes di-chromic, but merely a 'weakness' of vision.