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Gives diagram and explanation of TY's reduced parallax. JH's formula is elaborate but complicated. TY's formula is less exact but easier for public to use. Welcomes criticism.
Board of Longitude will meet on 3 Jan. to examine instruments and proposals, and to consider Fearon Fallows's report from Cape of Good Hope.
Board of Longitude reluctant to pay for new building at James South's unless South and JH agree to place their observations at Board's disposal.
Next meeting of Board of Longitude.
Asks JH to check accuracy of Nautical Almanac entry for Jupiter's satellites III and IV on 20 Aug. 1819. Thanks for JH's note, but tell James South 'he is bound to give his reasons....'
Fears JH misunderstood TY's remark about the injustice of James South's accusation regarding Nautical Almanac. TY was not trying to provoke South's hostility. Sends 'Schumacher's No. 10' for JH's perusal.
Leaving for two weeks in Netherlands.
Has no errands for JH in Holland or Flanders. Asks for details on JH's and Charles Babbage's method of determining heights by barometrical observations. Hopes to use this to confirm TY's method by 'my formula deduced from refraction.'
Sends papers for R.A.S. and A. J. Fresnel's papers. Modifies analogy of infinite pipes to clarify TY's hypothesis of three principal colors. Charles Babbage sent survey of Mont Cenis. Can JH find its barometrical observations?
Board of Longitude will meet at TY's home on Saturday.
JH is correct, and TY's 'little man is wrong.' Moon's apparent angular motion increases as spectator moves closer.
JH carried portable barometer by Edward Troughton and thermometer by Mr. Newman to Europe and compared these to instruments used by individual scientists and observatories. Reports results to Board of Longitude.
Repeat computation for Jupiter's satellite IV [see TY's 1824-4]. Explains W. H. Wollaston's 'blue bow.' See figure 422 of TY's [Lectures on Natural Philosophy].
Thanks TY for books and for taking charge of [G. A. A.] Plana's plates. JH mentioned Eilhard Mitscherlich only when no other proposals came forth. Matter was left hanging. Assures TY that JH was not offended [see TY's 1824-11-21, i.e., #1075]. Regrets 'dilapidated state of scientific matters' in R.S.L.
As R.S.L. vice president, JH should reconsider his report favoring Eilhard Mitscherlich over W. H. Wollaston. This may be last opportunity to pay Wollaston a 'just compliment.' Agrees with JH that much in R.S.L. 'nicknamed science [is] sleight of hand,' and that 'great injustice is done to men of science.' But TY expects a short life and tries not to be concerned about approval of others.