Comments on calculation by Frédéric Petit of the hyperbolic orbit of the meteor of 19 Aug. 1847.
Comments on calculation by Frédéric Petit of the hyperbolic orbit of the meteor of 19 Aug. 1847.
About Henry Warburton's theorem, and the Gregorian calendar.
About JH's poor health; some problems in perspective. Having read a book on Egyptology, JH wanders off in flights of fanciful numerology.
About JH's poor health; mentions discovery of two asteroids and new rings of Saturn.
Comments on astronomical discoveries, and depressing life in London.
JH looking for some writings by Isaac Newton while at the Mint, but most of that seems to have vanished.
Asks for the experience of other countries in introducing decimal coinage.
Thanks for AD's report on coinage [see JH's 1853-4-11], and for AD's puns.
JH's copy of Apollonius's work on conic sections was given to Francis Baily. [P. L. M. de] Maupertuis's letter to [James] Bradley is 'real prize.' Comment on AD's puns. Finds W. R. Hamilton's Quaternions 'horribly metaphysical.'
Comments on circulation of new coinage, and on another integral of Henry Warburton's.
Sends Henry Warburton's equation and integral; thanks AD for humorous story sent to Collingwood.
Accepts AD's correction regarding Henry Warburton's writings [see JH's 1854-11-2].
Expresses great sorrow at the death of Richard Sheepshanks; JH has been ill for many months.
Comments on Francis Baily's travel writings and on Richard Sheepshanks's epitaph.
On AD's note on Richard Sheepshanks's writing on the standard yard.
On proper and bad Latin.
Comments on the state of JH's health, and on things astronomical and mathematical.
Wants to make a new musical instrument on the principle of resonance; JH also suggests some improvements in the construction of the organ.
Thought that AD's last letter was supposed to be written in verse. Hopes his injury will soon improve. Does not recollect any habit of Humphry Davy rubbing his hands together. A professor, [G. J.?] Stoney, has re-invented JH's collimating telescope and not improved it.
Comments on the state of JH's health, color blindness, missing R.A.S. Notices, and decimal coinage.