Wants WH's quaternion mathematics to be challenged; also worries that quaternions will become merely 'a private and personal skill' instead of a method that can be taught.
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Wants WH's quaternion mathematics to be challenged; also worries that quaternions will become merely 'a private and personal skill' instead of a method that can be taught.
Describes the funeral of James MacCullagh; mystified why he committed suicide.
Sends some new theorems concerning undisturbed parabolic motion; believes that much remains to be discovered in this field.
Sends some results concerning undisturbed parabolic motion. Laments the Irish famine.
The equatorial on the Dublin Observatory dome needs improvement. In the last fifty-two months, WH has seen three new planets: Neptune, Iris, and Flora.
WH notes that quaternions derive some interesting results in problems with three moving bodies.
Thanks WH for 'plan' of [asteroid] Iris. Family is happy to have WH's son (JH's son William's friend) with them for holidays. Recounts their playful and adventurous activities.
On WH's 'Hodograph' and theorems of parabolic motion and the relation between velocities, initial velocities, and time. Praises WH's son. Cape Results nearly finished. Revising book on astronomy. Plans to 'attack' quaternions. Mentions parabolic functions and Benjamin Peirce's claim that the discovery of Neptune was accidental.
Seeks London bookselling agent through whom to direct copies of JH's Cape Results for Dublin scientific groups. Discusses pretty names for new planets. Thanks for WH's memoir on quaternions.