Opticks 1717 - Up

8,~
Chufe which depends, not on any confine of
Shadow. What this Gaufe is will be fllewed in
the next Bc&
TO . tlpzfe Experiments ma be added the
jenth Experiment of the firi% !ii oak, WlJere the
Sun’s Light -in a ,darlr Room being trajetied
through. the parallel Superficies of two lfrilills
tied together in the form of a ,I’arallelopipedej
~ecanyz totally of one uniform yellow or red
olour 9 at its emerging out of the Prifnis.
Pgere,. in the producfrion of thefe colcurs, the
Gonfine of Shadow can have nothing to do,
For the Light changes frown -White to yellow,
orange and red Skceilivel , k.tl1ou.t any alte,
ration of ,the Confine of s r ladow : And at both
edges, of the emerging Light where the contrary
Confines of Shadcw ought to produce
different EffeAs, the Colpur is one and the
‘fame, whether it be white, yellow, or~~ngc or
red : And in the middle of the emerging Light,
where’ there is no Confine of Shadow at all, the
Colour is .the very &me as at the edges, the
whole Light at its very firlt E.imcrgence king
of one uniform Colour, whether white, yclloW,
.orange or red, and ,going ‘on thence perpet~~al-
1 without any change of Colour , fii~h as the
e onfine of Shadow is vulgar1 Suppofcd to work
in refra&ed Light’ after its F, ‘~‘n~crgence). Neither
can thefe Colours arife from any nets Modifications
of the Light by Refra&i.ons, becaufe
they change f~~ceffively from~hit~ to yellow,
orange and red, ,While the Refi+aCi;ions remain
the itine, and alib becd~ the Iiefra&ions arc
n-u& contrary WIYS by prallel SLI~~X~~C~W w~$c$
.
def boy