On the 'misfortunes & mishaps' of the Aden magnetic observatory and on the proper care of magnetical instruments.
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On the 'misfortunes & mishaps' of the Aden magnetic observatory and on the proper care of magnetical instruments.
Has received JL's memoir on the tides. JH would like to amalgamate certain portions with a memoir from William Whewell. JH adds some comments on photographic experiments he has made.
No summary available.
Comments on several different reports; also on some experiments that lead JH to think much of the radiant energy of the Sun is absorbed in the atmosphere.
Thanks for 'small, but intense' volume sent.
R.S.L. business about an observatory at the North Cape in Sweden.
Believes that R.S.L.'s request for £3000 grant to establish permanent magnetic and meteorological observatory is too hasty. Urges caution. Points out potential problems.
In light of minutes of R.S.L. Council meeting, outlines vision of permanent national physical observatory and, more importantly, an experimental institute or college. Hopes Edward Sabine will be interested.
Is displeased by R.S.L. Council's seemingly rash resolution with regard to idea of permanent magnetic observatory.
Thanks for letting JH know about honor accorded at 'the Anniversary' [Meeting]. Offers condolences on JL's 'late severe loss.'
Is unable to come to London for the Standards Commission meeting and thus will also not be able to come to the dinner party. Encloses some recent photographs.
Comments on a paper on the calotype by W. H. F. Talbot, adding some experiences of his own on the subject.
Comments on Louis Daguerre's work, and on the question of a North Cape observatory.
As the Committee is to meet on Thursday he thinks it should reconsider its decision not to publish W. H. F. Talbot's paper on the Calotype process. Gives reasons as stated in a letter he has received from Talbot.
Comments on balloon ascent report, photographic paper made with vegetable colors, and the need to provide a polarizing crystal to J. B. Biot.
Mostly news of JH's family; JH inquires as to the state of health of JL's mother.
JH expresses some concern about the accuracy of a wet bulb thermometer, as he is not clear about the nature of the experimental base for its use.
Promises to become more knowledgeable about [heat?] theory in order to be able to discuss it with JL. Cautions that the subject is an intricate one.
JH comments on JL's 'memoir on the heat of vapours,' indicating JH's dissatisfaction with the experimental basis (the experimental work of J. L. Gay-Lussac) for the conclusions. JH offers improvements in the construction and operation of the ice calorimeter.
Has received the books. Began with Karl Holtzmann's and finds the reasoning at fault. Comments on this. [Marked 'not sent.']