Passes on information on stars received from a Bengal pilot.
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Passes on information on stars received from a Bengal pilot.
Offers some possible explanation for what the unnamed observer saw [see GA's 1860-3-1].
Is arguing for the development of a British metrical system based on the length of the polar axis of the earth.
Regarding the printing of JH's British Metrical scale. Comparison between the chimes of Big Ben and those of St. Mary's, Cambridge.
Further details on the chimes of Big Ben.
[Form Letter] GA's address, as Astronomer Royal, to Board of Visitors. Progress report on F. G. W. Struve's proposal for joint French-English-Belgian triangulation survey.
Urges JH to attend the next meeting of the Board of Visitors of the Royal Observatory, especially as GA believes some of the members of the Board do not understand the scientific problem [?].
Asks for details about a strange drawing of Jupiter JH had seen at the Royal Observatory some months earlier, and offers some comments about Warren de La Rue's eclipse photographs.
Circular letter advising of the availability of back copies of various Royal Observatory printed observations.
Comments on Jupiter's appearance and on the eclipse photographs [see JH's 1860-8-23].
A note with a copy of JH's article on telescopes for the Encyclopaedia Britannica, together with some papers to be forwarded to James Glaisher.
Thanking him for his paper on telescopes. Observations of JH's semicircular map of the world.
Has tried a number of different fractional projections, some more interesting than others [see GA's 1860-12-7].
Offering sympathy on the death of JH's daughter [Margaret Louisa].
Reminds JH that the algebraic formulation of the theory of the achromatic telescope eyepiece was formulated by GA.
Is sending a tract on 'Probable Errors.' Further observations on JH's article on telescopes.
Recognizes the validity of GA's claim to the eyepiece theory [see GA's 1861-3-27]; JH did not have space to deal adequately with the subject of telescopes.
Asks for his comments on the results of his Magnetic Register 1848-1857.
Further remarks concerning his Magnetic Registers [see GA's 1861-4-22].
Asks GA many questions about his magnetical explanation [see GA's 1861-4-22].