Mi fceUanea Curio fa, 199 



fraction: But emerging obliquely into the 

 Air, it was refraded towards the Perpendi- 

 cular fCj and there received a new Direction 

 to x. And therefore the fpace *#-.fubftend- 

 ed the Angle of Refradion acx; which we 

 meafur'd and found as follows. 



The height of the Objed^ inches Depths 

 above the Axis of vi-( 



fual-Ray ax the unre-f 

 ■ec\ — ~ -> 



4^5 



traded 



The Diftance of the Ob-^ 



jed from the RefradY 6ll 



ing Plain, &c. about r 



51 Feet or — — ^ 

 Therefore the Angle of? Q ^ 



Refradion acx was — $ 

 The Angle of Emerfion-j 



pra (by the Conftrudi-Y 62t 



on of the Cylinder) f 



was ■ — ■ — ~ ' — ' J 

 Therefore the Angle of] 



Incidence (=jw* J> 62. 27. 37- 



-U ^cx - — ■ ™ •■—'J 

 And therefore univerfally (according to 

 the "known Laws of Refradion) 

 The Sines of the Angles? IO000O 



of Incidence being — J 

 The Sines of the Angles? I00O3 <j 



Emerfion are — — 5 

 And the Refradive Pow-7 ^ 



er of the Denfe Air 

 Bv the Refradive Power of a pellucid Bo- 

 dy, I mean that property in it whereby the 

 Oblique Rays of Light are diverted from 

 their dired Courfe J and which is meafur d 



o 4 °y 



