Will send JH some barometric observations; describes the barometers with which the observations were made.
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Will send JH some barometric observations; describes the barometers with which the observations were made.
Discusses casting and construction of telescope speculae.
Offers to participate in determining stellar parallaxes by finding the angle position of double stars. Apprises Henry Kater that he has never seen Saturn's rings separated. Includes micrometer measurements of Saturn and Jupiter.
Wrote letter to clarify ideas, without intentions of publication. Discusses light and spectrum of Thomas Drummond's lamp.
Comments extensively on paper on limit of vaporization and its significance in helping to settle ideas on constitution of the atmosphere.
Declines an invitation of JH's, being 'engaged sixteenfold' that day. Invites JH to a party another day.
Has a micrometer under construction and gives details. Pietro Prandi has published a second memoir on mercury covered with sulfuric acid.
Encloses a letter from Dr. John Brinkley. Please send on his manuscript catalogue of nebulae. Regarding the reading and printing of CB's paper at the Analytical. Site for his pendulum experiments.
Invites HK to dinner Saturday to meet James South and Alexis Bouvard.
[Responding to WT's 1826-3-24], JH concurs with P. S. Laplace's view about the advantage of astronomical observation from high elevations, e.g., from mountains. Comments on telescope prices, a paper by WT, Florence, and JH's plan to visit the Continent.
Sending a paper for the R.S.L. Humphry Davy does not approve entirely of his arguments. Would be pleased if JH would glance over it and then inform Davy that he has it.
Has read his paper on vaporization with much interest and can see no objections to its arguments. Comments on some of the details.
[More detailed version of JH's 1826-5-26]. Has mentioned it to Humphry Davy.
Was grateful for JH's letter and detailed notes. Hopes he will attach a copy to the paper when he communicates it to the R.S.L.