Sends GA two more spectrum photographs [see JH's 1842-4-10], and believes that these may lead the way to color photography.
Showing 41–60 of 188 items
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.
Tells GA about a new comet becoming visible.
Concerned that the Colonial governors were not provided with copies of the Standards Commission Report; will not be able to get to Switzerland this year.
Asks GA on behalf of F. W. Bessel, for unreduced positions of a star that FB wishes to examine for annual parallax.
Apologizes for confusion about F. W. Bessel's request [see GA's 1843-6-6], but JH had neglected to check date on FB's letter.
Is expecting to be summoned to Slough, about repossessing JH's [and William Herschel's] old premises; this will affect JH's availability for a meeting [see GA's 1843-6-24].
Finds GA's measurements of Gamma Virginis far away from JH's own, and instructs GA in the best way to measure double star positions.
Has received a request from the Admiralty to order a new telescope for the Cape observatory; at the same time, JH has received an unsolicited offer of a lens. JH seeks advice and information from GA.