Claims to have demonstrated that light intensity increases as distance from light source increases. Applies this to inner planets, where sun should appear dimmer than on Earth. [JH annotation: 'Frivolous & Vexatious.']
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Claims to have demonstrated that light intensity increases as distance from light source increases. Applies this to inner planets, where sun should appear dimmer than on Earth. [JH annotation: 'Frivolous & Vexatious.']
About repayment of a loan made from JH.
Acknowledgement of fulfilling JH's requirements.
Replies to JH's inquiries about Messier 80, noting that a bright star, since vanished, obliterated the cluster. Describes poor but improving instrumentation at the Madras Observatory. Asks about JH's son Alexander.
Thanks JH for a memoir on the projection of a sphere. Expresses the wish that map-making, so neglected, be taken up thoroughly.
Sends Mathematical Monthly with JH's portrait and catalog of his writings. Smithsonian will send rain data JH wants. Discusses politics and hopes England will help break the cotton monopoly and thereby end slavery.
Like JH, Smyths have been suffering bronchial problems. Urges JH not to give up [see JH's 1861-1-29] plan of JH writing a review on terrestrial magnetisim.
Sends letter regarding meteorology from the Smithsonian to JH. Pleased with magnetic work of [A. D.] Bache at Girard College.
Certain the Colonial Secretary [Duke of Newcastle] would write to governor of Malta on behalf of [William] Lassell.
Encloses letter from [W. P.] Wilson of Melbourne and ES's response for JH's perusal. Discusses [Warren] de La Rue's work on solar photography.
Requests JH sign certificate for [W. F.] Hook. Asks JH to forward it to William Whewell for his signature.
A metallic thermometer will be constructed at Kew Observatory to test JH's proposal. Experiments on Index of Friction of gases to be resumed at Kew.
Sends bulletins of the Observatory, which contain both meteorological and astronomical information. Asks JH if experiments are worth pursuing.
Discusses 'autograph of the sun' he sent earlier. Discusses measuring relative temperature of sun. Has an unpublished letter of Galileo to Cardinal Barberini regarding sunspots.
Discusses Galileo's unpublished letter on sunspots. Outlines comparisons between tropical storms and sunspots as discussed at Cambridge Philosophical Society. Wishes to meet [Frederick] Howlett to discuss sunspots.
Sends series of solar heliographs. If further suggestions for improvement of these are noted, please send them. Is preparing to photograph Dec. 31 eclipse.
Condolences on death of JH's daughter [Margaret] Louisa.
Detached postscript discussing sunspots, comparing them to the low barometric pressure center in cyclones. J. S. Henslow is dying.
Talked to [L.-F.-C.?] Breguet for JH. Discusses work [on hygrometer?/metallic thermometer?] in detail, including diagrams. Regrets not having seen JH's daughters in Paris. Says he is recuperating from the 'catastrophe' and can still use his left eye.
Forwards letter to HR from [L.-F.-C.?] Breguet, who desires to construct a metallic thermometer for JH. HR requests quick reply from JH.