Corrects date on publication by G. A. Erman.
Corrects date on publication by G. A. Erman.
Asks JH questions about a paper on the dispersion of light from beyond the visible violet end of spectrum.
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.
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].
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.
Comments on one of the magnetism experiments JH described in his letter of 1856-7-14.
Says that Council of R.S.L. will reconsider whether William Pole's paper on color-blindness should be published.
Approves changes made by William Pole in his paper [see GS's 1859-4-21]; comments on appropriate presentation of JH's report on it.
On some changes to the report on paper by William Pole [see JH's 1859-4-24]. Describes some experiments carried out with colored 'prismatic' light.
Additional comments on William Pole's paper [see JH's 1859-5-13]; adds comments lost from JH's paper on sound.
Comments on the effect of intensity of illumination on the distinctness of the spectrum.
Comments about reflective power of metals.