Describes, using a diagram, how the solar protuberances appeared to him as a color-blind person when he observed a solar eclipse.
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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.