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Showing 61–80 of 126 items
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Supports, for scientific and commercial reasons, the retention of the British system of measures, arguing against adoption of the metric or decimal system.
Learned that R.A.S. plans to use aplanatic lenses for solar studies. Submits set of unpublished tables by W. L. Newman [see Newman's 1845-2-18] for calculating radii of such lenses. Refers to work of this kind by Josef Fraunhofer, [G. P.] Bond, K. A. Steinheil, and C. F. Gauss.
Thanks for his books. Encloses one of his own pamphlets on Atoms, which will show his personal view of mind versus matter. Comments on some of Haig's terminology.
Responds to objections published in the Times of 30 June to JH's 1864-6-18 letter to the Times regarding the introduction of the metric system in England; JH opposes this and goes on to explain the scientific basis of the British system.
Responds to WW's comments on JH's Iliad translation. Sending Book X.
Corrects typographical errors in JH's recent letters [1864-6-18 & 1864-7-1] to the Times.
Sends WS William Herschel's chromatic observations of Beta Cygni. Completing 'Catalogue of Nebulae.' Works on translating Book IX of Iliad; fears he will not complete translation of Iliad.
Comments on the state of JH's health; about ciphers and about decimalization.
Comments on remedies suggested by AD [see AD's 1864-7-15]; on ciphers.
Cannot find the source of supposed Wilhelm Struve probability calculation; believes he has made a mistake. Regrets the error was not noticed in time to correct the seventh edition of Outlines Astr.
Thanks for and comments on papers on scientific history and molecular physics, particularly on a magnetic experiment and on dynamical efficiency of coal relative to motion theory of light and heat. Comments on nature of heat, 'vis viva.' Deplores laxity with which physicists use and confuse terms 'force,' 'motion,' and 'energy.'
His son informs him of the projected series of lectures at the Royal Institution on weather forecasting and meteorology. Comments on this.
About family finances, JH's health, and activities around the house.
Describes a revolving eyepiece that could protect the eye from excess light in solar observation.
Believes he will complete Iliad.
Some friction has arisen between JH and MH over finances, and JH apologizes; JH is describing the newly-acquired horse, and reports on mail received and the activities of the children.
News of Herschel family. JH asks for information about 'India Stock' [investments].
If RC's formulas for sunspots are correct, then 'trade-wind theory' is challenged and sun's photosphere may behave as envelope circulating around sun according to laws of planetary motion. Questions formula relating to sunspot velocity.
Comments on minting of coins [see AD's 1864-8-18], the state of JH's health, and the need for an elocution teacher for one of JH's sons.