Asks JH questions about a paper on the dispersion of light from beyond the visible violet end of spectrum.
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Asks JH questions about a paper on the dispersion of light from beyond the visible violet end of spectrum.
Replies to several queries about papers of JH. JH describes the accidental production of some interesting copper salt crystals.
Has been studying the spectral lines of 'invisible' rays.
Thanks GS for 'canary' glass. Pleased with GS's 'photological' research, extending the spectrum.
Asks about problems in GS's paper that JH is reviewing. Remarks on spectral lines paper presented by Antoine Becquerel to Academie des sciences.
Surprised by length of spectrum produced by the combustion of metals, using electricity.
Thanks GS for his paper on fluorescent spectra; JH is interested in having these rays used on quartz, hoping to find his 'thermic' rays acting.
Writes to acknowledge receipt of a testimonial on behalf of [George] Wilson.
Just received JH's report on GS's paper on refrangibility of light. Elaborates on lavender and brown rays.
Comments on color as a sensation, and on GS's thoughts on 'lavender rays.'
Advises GS against spending £800 to verify the available drawings of Saturn; instead JH suggests alternative methods.
Declines to serve on experimental committee for R.S.L.
Agrees to help in other ways than as committee member [see JH's 1855-2-25].
Asks GS about ordering instruments from [George] Wilson.
Inquiring about the cost of instruments being shipped.
Writes to clarify his understanding of the word 'fluorescence.' Asks JH to review a paper on color-blindness.
Comments on GS's ideas [see GS's 1856-6-27] about the nature of fluorescence. Asks for strong horseshoe magnets from R.S.L. to try to solve the problem of 'Mahomet's coffin.'
Further thoughts [see GS's 1856-6-27] on the nature of fluorescence, including that it is a transient phosphorescence.
Continues comments on fluorescence from letter of 1856-7-8; then shows mathematically that JH's solution for the problem of Mahomet's coffin [see GS's 1856-7-1] will not work.
Thanks for the magnetic theory [see GS's 1856-7-9] and agrees it argues against JH's ideas about Mahomet's coffin. Describes some interesting magnetic experiments JH has seen.