Thanks for the paper on the photographic effect of light on drugs. JH also comments on the photographic experiments of Mary Somerville.
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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.
Thanks for the paper on the photographic effect of light on drugs. JH also comments on the photographic experiments of Mary Somerville.
Thanks RH for the papers of researches on light just received.
JH sends some examples of a unique kind of latent photograph, and adds other comments about various aspects of photography. JH has seen a good aurora. He now agrees with A. C. Becquerel's theory of the spectrum.
Letter writing has been delayed by the crush of other business. Comments on names for various aspects of heat, light, color, and phlogiston. JH describes the actions in his 'amphitype' process. Is looking forward to RH's forthcoming work on photography.
Does not think that RH would be satisfied with the position of Assistant Secretary of the R.S.L., as it is largely clerical, and would not allow much time for chemical or photographical experiments. JH is not aware whether there is a position available at the Royal Institution, but would be willing to speak to Michael Faraday.
Cannot provide any specimens of photography or the spectrum good enough for an exhibition, as most have faded. A French chemist just announced as a discovery a fact long since known by JH.
Thanks for the 'exquisite specimen of Daguerreotype.' Speculates on the possibility of making Daguerreotype portraits small enough to be set in rings or in shirt pins.