VIIl] 



THE BISECTION OF A QUADRANT 



365 



of arc of the whole sector which we wish to di\dde), and on the 

 horizontal scale the corresponding values of 6, or the angle which 



Angle (6) determining the intersection of the partition -wall with the outer border 



of the cell. 



2-0 

 1-8 



w 



3 



eS 



ft 



1-4 ^ 



M 



a 



Hl-2l 



a 



aT 



o 

 1-0 .-s 



- .8 S 



-•2 



Fig. 150. 



determines the point on the periphery where it is cut by the 

 partition- wall, MP. Two limiting cases are to be noticed here: 

 (1) at 90° (point A in diagram), because we are at present only 



