518 



The Bev. S. Haughton on some new Laws 



An attentive examination of the fifth column proves completely 

 the truth of Law VI. ; and a comparison of the values of t in 



Tables VII., VIII., IX. proves the truth of Law IV. 



The principal incidence is 55° 13', and the quantity of light in 

 the plane of incidence is to the quantity of light in the perpen- 

 dicular plane as 1 : 1*82. 



Having ascertained the truth of the six laws stated at the 

 commencement of this paper, I removed the compensator and 

 made the following direct experiment, by which is shown the 

 possibility of obtaining circularly-polarized light by means of a 

 single reflexion, not total, at the surface of a transparent body : — 



Angle of incidence . . = 55° (V 

 Polarizer =85° 50'. 



On turning the analyser round through 360°, it was not pos- 

 sible to detect any change in the intensity of the light, which 

 was therefore sensibly circularly polarized, proving the truth of 

 Law III. directly. 



The truth of Laws II., III., IV. is made very evident by the 

 following table formed from the preceding tables. 



Table X. 



From this table it appears that the value of the azimuth, which 

 I have called the circular limit, is 85° 52'. 



Collecting together the values of the principal incidence, or 

 incidence for which the axes of the reflected elliptically-polarized 

 light he in, and perpendicular to, the plane of incidence, we find 



Table XI. 



