Opticks 1717 - Up

54J‘
T&s Ex@cation of the Rain-bow is yet fi~r-
&er confirmed by the known Experiment (made
by. .AaxLkr iA? Dominis and De.r-CLzrtes) of
]hq$ng LIP any where in the Sun-ihine a G~Iafs
Globe filled with Water, and* viewing it in Sucll
a p&~-e that the ktys which come fkoin the
Globe to the Eye qay contain with the SWUI’
J&q6 arz Angle of either 42 or 50 Degrees. For
if the Angle be aabout 42 01‘ 43 Degrees, the
Sp&ator ( fuppofe at 0) ihall fee a full red
Golow in that fide of the Globe opp~fed to
the FJLI~ as %is reprefented at li;, and if that An.
gee become leij: (1‘~lppoik by depreiIing the Globe,
to E) there will a,ppear other ~olours, yellow,
green and blc LC fezccef2ivcIy in. the hxe fide”of
the Globe; KLLI- if the Angle be made about .
.pDegrces (iuppol’e by liftin LIP the Globe to
G) thel-e will appear a ~-ed ~,ohr in that fide
of the #Globe towards the sun, and if the Angle
be made greater (liipofc by lifting up the
Globe to 13) the red wA,:trrrn iimcccllivcly to
the othq colou2”s) yellow, green and blue.
The Sam thing I have tried by k.ttil\g a Globe
reit, and raiiing .or depreiling the Lye, or ‘otherwiii’
moving it to make the Angle of a jufE
magnitude,,