Reports on JH's actinometer observations. Explains why he subscribed to 'Col. [Harry] Smith's piece of plate.'
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Reports on JH's actinometer observations. Explains why he subscribed to 'Col. [Harry] Smith's piece of plate.'
Much obliged for F. W. Bessel's zone. Thinks his own extra meridian observations of the comet will be respectable. Feels sure Fearon Fallows could not have approved of the supports of the dome. Has been promised the pleasure of inspecting the expenses of the Observatory. Captain J. E. Alexander and Dr. John Murray will call this morning for a parting cup of tea.
Sends a list of additional stars to be measured for JH to use as standards.
About an anomaly in one of JH's lists of observations.
About the principles whereby the nomenclature of the constellations might be reformed.
Has installed his astrometer to help judge star magnitudes; also makes a comparison of barometric observations with those of TM.
Has compared TM's observational measurements with those of the Brisbane catalogue, and finds TM's observations to be better; is working on a star photometer.
JH's observations of the comet [Halley's], together with comments on constellation nomenclature and stellar magnitudes.
Sending some equipment back and forth, and some astrometer readings.
Sends observations of several more standard stars, and of the comet.
Sends formulae for dealing with the apparent differences, in viewing the comet and compared star, due to the effects of parallax and refraction.
Calms TM about not having his comet observations published yet; those published so far are not of much value.
A note along with a request from Niccolo Cacciatore for some observations that JH says he cannot make.
Having read John Burrow's book, JH proposes procedure for analyzing masses of data from [African] Expedition. Will volunteer to interpolate chronometer errors if TM will undertake computations.
Finishing his copy of the panorama taken from the summit of Paarl rock. Needs TM's star reductions as soon as possible.
Thanks TM for the right ascension reductions. Saw the comet [Halley's] last night, but it was dimmer than before.
Asks for TM's barometer and thermometer readings for 20-28 September.
Uncertain when they are traveling to Paarl.
Invites TM to come see Halley's Comet in JH's large reflector. JH reports his observations of the comet.
Calculates the location of the comet [Halley's].