Considerations of Mr. Hook upon Mr. Newton's Discourse of Light and Colours

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                                most certain, and that thereby a differing pulse is propagated, <u>both</ on
those sides, <u>and</u> in all the midle parts of the Ray, is easy to be con=
ceived; <u>and</u> also, that differing pulses or compound motions should
make differing impressions on the Eye, brain, or sense, is also easy
to be conceived, and that, whatever refracting medium does again
reduce it to its primitive simple motion by destroying the adventitious
dose likewise restore it to its primitive whitenesse and simplicity.

But why there is a necessity, that all those motions, or whatever
else it be that makes colours, should be originally in the simple
Rays of Light, I do not yet understand the necessity of: no more
than that all those sounds must be in the Air of the Bellows, which
are afterwards heard to issue from the organ-pipes, or in the string,
which are afterwards by different stoppings and strikings produced;
which string, (by the way) is a prety representation of the shape
of a refracted ray to the Eye; and the manner of it may be somewhat
i<s>m</s>magined by the similitude thereof; for, the Ray is like the string
strained between the luminous object and the Eye, and the stop or
fingers is like the refracting surface, on the one side of which the
string hath no motion, on the other a vibrating one. Now we
may say indeed and imagine, that the rest or straightnesse of the
string is caused by the cessation of motions or coalition of all Vibra=
tions, and that all the Vibrations are dormant in it: But yet it seem's
more natural to me to imagine it the other way.

And I am a little troubled, that this supposition should make M<sup>r</sup>.
Newton wholly lay aside the thoughts of improving Telescopes and
Microscopes by Refractions, since tis not improbable, but that he that
hath made so very good an Improvement of Telescopes by his own
tryals upon reflection, would, if he had prosecuted it, have done more
by refraction. And that Reflection is not the only way of improving
Telescopes, I may possible hereafter show some proof of the truth
is, the Difficulty of removing that inconvenience of the splitting of the
Ray, and consequently of the effect of Colours is very great, but yet not

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Robert Hooke
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Considerations of Mr. Hook upon Mr. Newton's Discourse of Light and Colours, 1672. From The Royal Society, RBO/4/45



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