Has performed some Newton's rings interference experiments. Asks whether such experiments have already been communicated to the R.S.L.
Has performed some Newton's rings interference experiments. Asks whether such experiments have already been communicated to the R.S.L.
Trying to understand David Brewster's results on absorption of light in gaseous state, and the dark lines in solar spectrum, the cause of which he misunderstands.
Offers JF advice about the telescope mirror [?] and looks forward to seeing JF on his way to France.
About observing binary stars. JH has decided not to accept the offer of passage on a war ship to the Cape of Good Hope, as he wishes to be beholden to no one for the results of the expedition.
Is grateful for the autographs and Dr. Thomas Raffles sends him thanks. Regarding various star readings. Has a problem connected with the satellites of Saturn. Hears that JH is contemplating a visit to the Cape to make observations.
It appears that Peter Stewart, MH's brother, is fighting some kind of battle, the outcome of which will affect the whole family. JH wants to help and offers £5000 through MH to Peter. JH has just completed writing his Treatise Astr.
JH is 'immersed in my nebulae . . .working day and night for dear life'; also found another double star. Urges MH to come to Slough with her mother and brothers.
Will check to see whether JH has a spare telescopic mirror JH can give TH. Comments on observing Gamma Virginis and other double stars.
Sending the speculum to Slough in order that JH may examine it. Departs for Paris tomorrow. Hopes to see him at the Cambridge meeting.
Recounts details of his visit to England. Gives his own recent astronomical observations. Is sending this via G. B. Airy in case JH has left.