No. 2.] 



TKIAD SYSTEMS— WHITE, COLE, CUMMINGS. 



65 



A\ 



\ 



^\ 



>5^ 



^:^ 



^A -.^^^^^ 



TlQ. 190. 



Fio. 191; H polygon ot nine sides. 

 54061°— 19 5 



/ / 



Fio. 192. 



