Letter from Henry Brougham (later Baron Brougham and Vaux), Edinburgh to Charles Blagden, Royal Society, Somerset Place, London

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                                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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Manuscript details

Reference
CB/1/2/195
Series
CB
Date
1796
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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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