72 JAMIX ON METALLIC HEFLEXIOX. 



intensity sufficiently to allow of the perfect polarization by Ni- 

 chol's prism. 



My experiments, performed with plates of steel and mirror- 

 metal well-polished, are given in the following tables : it will be 

 remarked, that the intensities of the reflected light, polarized in 

 the plane of incidence, vary little, and that they diminish pro- 

 gressively from the incidence of 90° to that of 0°. 



If, on the contrary, the light is polarized in the azimuth of 

 90°, the intensities diminish from the grazing incidence [rasante) 

 up to the angle of maximum polarization, and afterwards increase 

 up to the normal incidence. 



Steel. — Square root of the intensities of light reflected in the 

 plane of incidence : ii = 76 e = 57'53. 



