Letter from Henry Brougham (later Baron Brougham and Vaux), Edinburgh to Charles Blagden, Royal Society, Somerset Place, London
this consideration induced me to add many of the <u>queries <\u> which connect the two sciences together - - It may not be improper to add the following eight propositions con taining a <u>summary <\u> of the <u>theory, without <\u> the <u> Synthesis <\u>. <u>Prop. I The Sines of Inflection and deflection have each of them a given ratio to the sine of incidence. II. The angle of <u>Inflection <\u> is <u>equal <\u> to the angle of <u>deflection <\u> III. Rays which differ in Refrangibility differ also in In flexibility & deflexibility; the most refrangible, being least Inflexible and deflexible . IV. Rays which differ in refrangibility, differ also in re flexibility ; the most refrangible being least reflexible V. The angle of reflection is equal to the angle of incidence <u>only <\u> in the mean rays: in the red it is less, & in the violet <u>greater <\u> VI. The spectra by reflection, inflection, & deflection, are divided exactly in the harmonical way, like that by <u>refraction <\u> VII. The relative sizes of the parts of light, are found by calculation VIII. The colours of Bodies depend on the different reflexibility of the rays, the position of their particles, & the magni tude of these, in so far as this affects the position Hoping you will excuse the trouble I have given you, & accept of my sincere thanks for your kindness I remain &c H.B.
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Letter from Henry Brougham (later Baron Brougham and Vaux), Edinburgh to Charles Blagden, Royal Society, Somerset Place, London, 1796. From The Royal Society, CB/1/2/195
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