Requests publication of what will hopefully be JH's last letter on the Slough telescope [see JH's "[Reply to Dr. Robinson [on the Reflecting Telescopes of the Late Sir William Herschel]," Athenaeum, #836 (Nov. 4, 1843), 983-4.
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Requests publication of what will hopefully be JH's last letter on the Slough telescope [see JH's "[Reply to Dr. Robinson [on the Reflecting Telescopes of the Late Sir William Herschel]," Athenaeum, #836 (Nov. 4, 1843), 983-4.
Discusses meteor showers of 9 August 1840, emanating from a point in the constellation Perseus. Calls attention to a report on these meteors as seen from near Vesuvius in 1779 by William Hamilton.
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.
Reports his observations on the explosion at Dover of 19,000 pounds of gunpowder.
Describes a particularly brilliant aurora, which JH observed from Collingwood on the night of 6 May.
[Replying to remarks by T. R. Robinson reported in Athenaeum, #830 (Sept. 23, 1843), 866-7,] JH argues that William Herschel's 40-foot reflector was not a failure, noting, for example, the discovery by it of the sixth and seventh Saturnian satellites.
Continues the debate with T. R. Robinson [see Athenaeum, #830 (Sept. 23, 1843), 866-7; #831 (Sept. 30, 1843), 884; and #834 (Oct. 21, 1843), 945-6] on the quality of William Herschel's 40-foot reflecting telescope.
[The discovery of Neptune having been just announced], JH calls attention to JH's recent suggestion to the B.A.A.S. that such a discovery was imminent; states that in 1842 JH had discussed the idea of a trans-Uranian planet with F. W. Bessel, and that [J. C.] Adams of Cambridge had carried out an investigation comparable to that of U. J. J. Leverrier.
Reports that JH will discuss the discovery of Neptune in his forthcoming Outlines Astr. Mentions Benjamin Peirce's calculations regarding Neptune.
Reports witnessing a lunar rainbow, including a secondary rainbow.
Provides a rule for dividing vanishing lines in perspective drawing. [Written by 'Geometer', i.e., JH.]