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adeo æqualis æquatio almoſt alſo Angle Angulo Anſwer atque autem Axis becauſe cafu Caſe cauſe Centrum circa Circuli Colours conſequently conſider conſiderable cujus Curva Demonſtration deſcribed Diameter Digits Diſtance diſtantia eaſily Eclipſe effe ejus enim equal erit Eſq eſt etiam Eye-Glaſs firſt Fluxio fuerit funt Glaſs Glaſſes greateſt hæc Hans Sloan hath hujus Hyperbola ibid illa Initium Inſ Inſtrument inter laſt leaſt leſs Light Limb Limbus Linea Liſter Luna meaſured Moon moſt muſt Number Objećt Obſervations omnes paſs paſſed Poſition Priſm Produćts punctum quæ quam quibus quidem quod Rays Reaſon Refraction Refrangibility reſpect ſaid ſame ſay ſecond ſee ſeems ſeen ſeveral ſhall ſhew ſhould ſide ſince ſit ſive Skrew ſmall Solis ſome ſomewhat ſort Star ſtill ſuch Sun's ſuppoſe tamen Teleſcope theſe thoſe Uſe vero Whiteneſs whoſe
Página 133 - That the colours of all natural bodies have no other origin than this, that they are variously qualified, to reflect one sort of light in greater plenty than another. And this I have experimented in a dark room, by illuminating those bodies with uncompounded light of divers colours. For by that means any body may be made to appear of any colour. They have there no appropriate colour, but ever appear of the colour of the light cast upon them, but yet with this difference, that they are most brisk...
Página 131 - Some rays are disposed to exhibit a red colour and no other; some a yellow and no other, some a green and no other, and so of the rest. Nor are there only rays proper and particular to the more eminent colours, but even to all their intermediate gradations.
Página 133 - I shall conclude with this general one. That the colours of all natural bodies have no other origin than this, that they are variously qualified, to reflect one sort of light in greater plenty than another.
Página 133 - And by this inequality of refractions they become not only coloured, but also very confused and indistinct. 10. Why the colours of the rainbow appear in falling drops of rain, is also from hence evident. For, those drops which refract the rays disposed to appear purple, in greatest quantity to the...
Página 130 - ... greater. And for the same reason, if the rays of light should possibly be globular bodies, and by their oblique passage out of one medium into another acquire a circulating motion, they ought to feel the greater resistance from the ambient aether, on that side where the motions conspire, and thence be continually bowed to the other.
Página 134 - You may also see, that if any of the colours at the lens be intercepted, the whiteness will be changed into the other colours.
Página 157 - But to examine how colours may be thus explained hypothetically is beside my purpose. I never intended to shew wherein consists the nature and difference of colours, but only to shew that de facto they are original and immutable qualities of the rays, which exhibit them...
Página 128 - Prism without, so that the Light might pass through it, and be refracted, before it was terminated by the Hole: But I found none of those Circumstances material. The Fashion of the Colours was in all these Cases the same.
Página 146 - To me the fundamental supposition itself seems impossible — namely, that the waves or vibrations of any fluid can, like the rays of light, be propagated in straight lines, without a continual and very extravagant spreading and bending every way into the quiescent medium, where they are terminated by it. I mistake if there be not both experiment and demonstration to the contrary.