No summary available.
No summary available.
Thanks GA for exercising GA's usual discretion in the matter of the funding of Charles Babbage's calculating machine [see GA's 1842-9-26].
No summary available.
Arranging a visit for GA to Collingwood.
Final arrangements for GA's visit to JH [see GA's 1842-3-15].
No summary available.
Sends GA a spectrum photograph, and explains how JH obtained it.
Sends GA two more spectrum photographs [see JH's 1842-4-10], and believes that these may lead the way to color photography.
No summary available.
Asks GA's opinion as to whether Ordinance observatories should make their magnetic observations on a 3-minute or 5-minute system.
A note to accompany some letters being returned to GA.
Is organizing a committee to revise the instructions for observers at magnetic observatories; GA is on it.
About eclipse observations of 1842, together with JH's speculations about the existence of an atmosphere around the sun. Enclosed is an eclipse drawing by Francis Baily.
Needs some clarification of GA's letter [see GA's 1842-9-16] before JH is ready to reply about the calculating engine.
Reply to GA's letter on Charles Babbage's calculating machine.
Gives GA some accounting of standard weights in Britain, and feels that it would be worth acquiring Robinson estate weight [see GA's 1842-9-22].
Unwilling to come to a meeting as JH anticipates the return of some of his children from the continent; seems considerable confusion as to who is to do what about star catalogues [see GA's 1841-7-27].
Needs a good artisan to construct the framework of a solar spectrum photographic apparatus.
Intends to accept offer [see GA's 1843-1-18]; JH questions the correctness of P. S. Laplace's theory of capillary action.
Would be pleased if Francis Baily and W. H. Miller would agree to serve [see GA's 1843-3-9]; believes sufficient remuneration should be provided for these responsibilities, and comments on the desirability of a continuing standards committee.