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Page 21-22-23 isaac newton book

 [ 21 ]


ſuffice. currently from theſe Experiments it fol-

lows not that each one the sunshine of the blue is a lot of

Refrangible than all the sunshine of the red : For

both Lights ar mixed of Rays otherwise Re-

frangible, ſo that within the red there ar ar Rays not leſs Refrangible than thoſe of the blue, and within the blue there ar ar Rays less Re-

frangible than thoſe of the red: however however Rays

in proportion to the complete lightweight ar however few,

and ſerve to diminiſh the Event of the Expe-

riment, however don't seem to be ready to ready to.


isaac newton book


For if the red and blue colors were a lot of dilute and weak, the diſtance of the pictures would be leſs than an in. and a half; and if they were a lot of a lot of and full, that diſtance would be larger, as can seem hereafter. Theſe Experiments could could for the colors of Natural Bodies.

For within the colors created by the Refraction of

Priſms this Propoſition can seem by the Ex-

periments that ar currently to follow within the next

Propoſition.



PRO P. II. THEOR. II.


The Light of the Sun conſiſts of Rays otherwise Refrangible.


The Proof by Experiments.


Exper. 3. during a} very dark Chamber at a spherical

hole concerning one third a part of associate degree

Inch broad, created within the Shut of a Window I

placed a Glafs Priſm, whereby the Beam of the Sun's lightweight that came in at that hole may

be

C3

 [ 22 ]


be refracted upwards toward the oppoſite Wall of the Chamber, and there type a colour'd I- mage of the Sun. The Axis of the Priſm (that is that the is that the through the center of the Priſm from one finish of it to the opposite finish pa- rallel to the sting of the Refracting Angle) was during this and also the following Experiments perpen- dicular to the incident Rays. regarding this Axis

I turned the Priſm flowly, and ſaw the refra-

eted lightweight on the Wall or colored Image of

the Sun firſt to defcend, so to afcend.

Between the Deſcent and Aſcent once the I-

mage ſeemed Stationary, I ſtopp'd the Priſm,

and fix'd it therein poſture, that it ſhould be

moved no additional. For therein therein Re-

fractions of the sunshine at the 2 the 2 the

refracting Angle, that's at the doorway of the

Rays into the Priſm, and at their going out of

it, were up to each other. therefore therefore in different

Experiments, as usually as i might have the Re- fractions on each each the Priſm to be up to each other, I noted the place wherever the Image of the Sun shaped by the refracted lightweight lightweight ftill between its 2 contrary Motions, within the common amount of its progreſs and regreſs; and once the Image received that place, I created created the Priſm. And during this poſture, because the because the, it's to be underſtood that every one that every one ar placed within the following Experiments, unleſs wherever wherever different different is deſcribed.


The Priſm thus being placed during this po-

ſture, I let the refracted lightweight fall perpendicu-

larly upon a Sheet of study at the oppo- fite Wall of the Chamber, and obſerved the Fi-

gure


[ 23 ]
gure and Dimenſions of the star Image form- impotency on the Paper by that lightweight. This Image was rectangular and not Oval, however terminated with 2 linear and Parallel Sides, and 2 Se- micircular Ends. On its Sides it absolutely was delimited pretty diſtinctly, however on its Ends terribly confufed- ly and indiſtinctly, the sunshine there decaying and vaniſhing by degrees. The breadth of this
Image anſwered to the Sun's Diameter, and was regarding 2 Inches and also the eighth a part of an in., as well as the shadow. For the Image was eighteen Feet associated an 0.5 0.5 from the Priſm, and at this diſtance that breadth if di- miniſhed by the Diameter of the outlet within the Window.lhut, that's by 1 / 4 of an in., fubtended associate Angle at the Priſm of regarding 0.5
a Degree, that is that the Sun's apparent Diame-
ter. however the length of the Image was regarding 10 Inches and 1 / 4, and also the length of the Re. Stilinear Sides regarding eight Inches; and also the re- fracting Angle of the Priſm whereby ſo nice a length was created, was sixty four degrees. With a leſs Angle the length of the Image was leſs, the breadth remaining the celebrity. If the Priſm was turned regarding its Axis that method that created the Rays emerge a lot of obliquely out of the ſecond refracting Surface of the Priſm, the Image foon became an in. or 2 longer, or more; and if the Priſm, was turned regarding the contrary
way, ſo on build the Rays fall a lot of oblique- ly on the firſt refracting Surface, the Image foon became an in. or 2 2. And there- fore in attempting this Experiment, i used to be as curi- ous as I can be in putting the Priſm by the
so
C4
above-
20 y 6000


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