Describes prismatic spectrum of flame of cyanogen and offers to repeat experiment with Michael Faraday for JH's benefit.
Showing 21–40 of 152 items
Describes prismatic spectrum of flame of cyanogen and offers to repeat experiment with Michael Faraday for JH's benefit.
Asks JH to clarify what goods are his from a joint order with WT from a German optical firm.
Queries and comments about telescopes and microscopes; some thoughts about a diffraction grating.
Renders an accounting of expenses for optical goods received from Germany.
Thanks WT for optical equipment sent. Notes death of Augustin Fresnel. Has purchased a telescope from James South.
Writes in favour of a London University professorship for Thomas Key. Refers to some optical experiments of Michael Faraday, and extends solution of conic section problem first raised in WT's letter of 1826-2-27.
Responds to WT's 1827-10-29. Sending JH's Light, which uses some of WT's publications.
Asks about a servant JH is considering hiring to accompany JH on JH's trip to the Continent.
Signing certificates for election to fellowship in the R.S.L. at this time [JH having been nominated for President] would be very awkward for JH, so he will not sign for WT.
No summary available.
No summary available.
No summary available.
Asks about rumor regarding JH going to Cape. Describes some electrical experiments WT saw at Royal Institution and refers to some WT carried out years earlier.
Asks for seeds and roots of native plants of the Cape. Refers to JH's writings on beating of the heart and comments on some optical experiments of Charles Wheatstone and David Brewster.
Comments on JH's paper on potash in Annales de chimie. Has observed reaction products in microscope. Concerned over delay in publication by David Brewster of his experimental results in optics and light, especially as WT not convinced of legitimacy of rumored results.
No summary available.
Has performed some Newton's rings interference experiments. Asks whether such experiments have already been communicated to the R.S.L.
Trying to understand David Brewster's results on absorption of light in gaseous state, and the dark lines in solar spectrum, the cause of which he misunderstands.
No summary available.
No summary available.