Isaac Newton to Henry Oldenburg

View transcription
                                changeable either by refraction or by the contermination of a quiet Medium. And as for 
heterogeneal light, it is but an aggregate of severall sorts of homogeneal light no one 
sort of w<sup>ch<\sup> suffers any more alteration then if it were alone because the rays act 
not on one another by <u>Prop<\u>. 6. And therefore the aggregate can suffer none. The (?)
two <u>Propositions <\u> also might be further proved apart by experiments, too long to be here
 described.
9. There can no homogeneal colours be educed out of light by refraction 
w<sup>ch<\sup> were not commixt in it before: Because by <u>Prop 7<\u> & 8, Refraction 
changeth not y<sup>e<\sup> quality of y<sup>e<\sup> rays, 
but only separates those w<sup>ch<\sup> have divers 
qualities, by means of their different Refrangibility 
10. The sun’s light is an aggregate of an indefinite variety of homoge-
neal colours: by <u>Prop<\u> 1, 3, & 9. And hence it, that I call homogeneal 
colours also primitive or original. And thus much concerning colours.
<s>M. Hugens <\s> Mons<sup>r<\sup> N. has thought fit to insinuate y<sup>t<\sup> y<sup>e<\sup> aberration of rays (by their different 
refrangibility) is not so considerable a disadvantage in glasses as I seemed to <s>make<\s> be
willing to make men Beleive when I propounded concave mirrors as y<sup>e<\sup> only hopes
of perfecting Telescopes.  But if he please to take his pen & compute the errors 
of a Glass & Speculum that collect rays at equall distances, he will find how 
much he is mistaken, & that I have not been extravagant, as he imagins, in
preferring reflexions. And as for what he <s>adds<\s> says of y<sup>e<\sup> difficulty of y<sup>e<\sup> praxis 
I know it is very difficult, & by those ways w<sup>ch<\sup> he attempted it I beleive it unpracticable.
But there is a way insinuated in y<sup>e<\sup> <u>Transaction pag <\u> 3080 [illegible]
by w<sup>ch<\sup> it is not improbable but that as much may be done in large Telescopes,
as I have thereby done in short once, but yet not without more than ordinary diligence & curiosity.
<s>Pray w<sup>th<\sup> these Notes return my thanks to M. Hugens for his book.
By a former letter of yo<sup>rs<\sup> I was a little dubious whether M. Slusius might not appre 
hend, by w<sup>t<\sup> you wrote to him concerning me, y<sup>t<\sup> I pretended to his Method of Drawing tangents;
untill I understood by M. Collins y<sup>t<\sup> you signifyed to him y<sup>t<\sup> you thought it here of a later 
date. For it seems to me that he was acquainted w<sup>th<\sup> it some yeares before he printed 
his Mesolabum & consequently before I understood it. But if it had been otherwise yet since he
first imparted it to his friends & y<sup>e<\sup> world, it ought deservedly to be accounted his. As
for y<sup>e<\sup> Methods they the same, though I beleive derived from different prin 
ciples. But I know not whether his Principles afford it so generall as mine w<sup>ch<\sup> extends to Equa 
tions affected w<sup>th<\sup> surd terms, w<sup>th<\sup>out reducing them to another form. But if you please let this 
pass.<\s>
<s>The incongruities you speak of I pass by. But I must as formerly, signify to you y<sup>t<\sup> I intend 
to be no further sollicitous about matters of Philosophy. And therefore I hope you will [illegible]
if you find [illegible] doing any thing more in y<sup>t<\sup> [illegible] you will 
favour me in my determination [illegible] so far as you can  conveniently my objections 
or the philosophicall [illegible]. For your prefer about my [illegible]
[illegible] I thank you. But I would not have you trouble yourself to get them excused if you have not 
done so already. And now being tired with this long letter, I must in [illegible]
Yo<sup>r<\sup> humble ServantI
I. Newton <\s>

                            
Please login to transcribe

Manuscript details

Author
Isaac Newton
Reference
EL/N1/47
Series
EL
Date
1673
IIIF
Open IIIF manifest
(What's this?)
This is a link to the IIIF web URL for this item. You can drag and drop the IIIF image link into other compatible viewers

Cite as

Isaac Newton to Henry Oldenburg, 1673. From The Royal Society, EL/N1/47

Copy

Comments

Please login to comment