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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.
Announces 2 June meeting of 'Commissioners for more effectually discovering the Longitude at Sea.' Inquired about 'excise,' but sees no reason to wait for Navy Board to act.
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.
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.
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....'
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.'