Promises in her next letter to comment about JH's 'chrysotype' photographic process.
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Promises in her next letter to comment about JH's 'chrysotype' photographic process.
[To JC as Secretary, Society for the Diffusion of Useful Knowledge:] Thanks for offer to send a copy of Augustus De Morgan's Differential and Integral Calculus.
Describes the total solar eclipse seen by Francis Baily at Pavia and George Airy at Turin. They were thrilled to witness three purple flames from the blocked sun emerge around the edge of the moon. Thirty more Cape Town sweeps remain to be reduced.
Seeks to clear up confusions about various photographic processes, e.g., the Chrysotype process, developed by JH, about which confusions arose from earlier reports on them in the Athenaeum.
Has been unable to make many readings with the actinometer. Is expecting some irregular readings with the magnetometers. Survey of South Africa appears very distant. Relates recent events in Natal and with the Boers.
Sends Joseph Cranch to consult with JH over an equatorial telescope for Harvard College Observatory.
Magnetic survey of Austrian dominions to be undertaken. Sending portable apparatus for survey in Mediterranean along with instructions from [Charles] Riddell. Completed sea observations for R.S.L.
Compliments JH's translation (1842) of J. C. F. Schiller's 'The Walk.' Is going to Scotland, then Switzerland. Has seen enough of America.
Would be pleased to be visited by C to discuss the application regarding glass [lenses] of various algebraic formulae devised by JH. Will also show C some of JH's recent work in photography.
Recounts details of his recent visit to England. Recent astronomical observations. Has JH heard from C. K. J. Bunsen about his award?
Asks GA's opinion as to whether Ordinance observatories should make their magnetic observations on a 3-minute or 5-minute system.
Thinks it necessary to revise the instructions for the magnetic observations. Makes some suggestions for the Report of the Committee.
Returning packet of papers on magnetism. Encloses copy of a letter he has sent to Edward Sabine. Has seen the recent eclipse of the sun.
Writes to send thanks by way of AH to the King of Prussia for the award of the Order of Merit. JH also comments on some astronomical matters.
Regarding the revision of the instructions for the magnetic observatories.
A note to accompany some letters being returned to GA.
Is organizing a committee to revise the instructions for observers at magnetic observatories; GA is on it.
Further remarks concerning the recent eclipse and his own and G. B. Airy's papers on the subject.
Thanks for the information on the eclipse. Comments on this. Events at the B.A.A.S. meeting. News of Wilhelm Struve's activities.
Has read G. B. Airy's paper on the eclipse. Would JH send on FB's remarks on the eclipse to Airy. Comments on the phenomenon of the eclipse.