Arranges to have tea with TM tomorrow at the Royal Observatory.
Showing 41–60 of 70 items
Arranges to have tea with TM tomorrow at the Royal Observatory.
Asks TM to accompany himself and Daniel Cloetes in hunting a leopard.
Does not want to compute precessions for each individual star.
Notes a discrepancy in TM's latest observations and those of Thomas Brisbane.
Congratulates TM on the birth of his son, George.
Inquires about a star not found in TM's list of comet stars. Believes that their comet collaboration is going well.
Discusses their table of comet stars.
Wants to reset his barometer by TM's.
Compares JH's and TM's barometric readings. Criticizes Pierre Morin's work.
Setting a unit of measurement for solar radiation (the 'actine'); proposes to 'take for a unit of solar heat that which if all employed in heating a cubic inch of water exposing a horizontal surface of one square inch, to a vertical Sun during one minute would produce a dilation of one thousandth part of its volume.'
Testing whether an actinometer with a glass back is more accurate than one without.
Is too busy to use Carl Gauss's magnetometer. Viewing Halley's Comet has interrupted JH's sweeps. Reports that Gamma Virginis is a single star in both the 20-ft. reflector and 7-ft. equatorial.
Reports the birth of his fifth child, Alexander Stewart. Has made some excellent observations of Halley's Comet. Asks CH to inform Carl Gauss that JH has not received Gauss's magnetometer nor is JH certain of how to use it.
Work nearly finished here. Has documented the sixth satellite of Saturn and has seen possibly a seventh.
Confident that 1837 will be his last year in Africa. JH's catalog of nebulae and double stars is nearly complete. Has a series of observations of Halley's Comet from 1836-1-25 to 1836-5-5. Although JH is too busy to undertake any magnetic studies, he has been providing information about Carl Gauss's magnetometer to the new observatory in Bombay. Recalls that Charles Babbage mentioned the 'principle' of Gauss's method 'at least 10 or 12 years' ago.
Thanks TM for restoring JH's micrometer.
Believes that JH and TM can compile a better comet catalog together than they could separately.
Thanks WS for having accepted his medal from R.A.S. Finds that the [Thomas] Brisbane Catalogue contains insufficient right ascension information, complicating reduction observations. Observed Halley's Comet.
Regarding the double star Gamma Virginis.
About observations of Halley's Comet. [In postscript dated 1836-5-3], describes further observations of the comet.