502 



Mr. H. H. M. Bosanquet on the 



— 6° 34/ sin z sin A) that Brewster's maps were constructed; 

 and the nature of the result will be best seen from the following 

 sketch, which represents the general course of the lines of equal 

 polarization on his two maps. The projection of I. is on the 

 plane of the horizon, of II. on a vertical plane normal to the line 

 to the sun. The projection is such that equidistant small circles 

 parallel to the plane of projection are equidistant on the projection. 

 Sketch of Brewster's Maps of Lines of equal polarization. 

 Fig. I. 



