16 



THE CORRECTION OF SEXTANTS FOR ERRORS 



OS 



be 



a 



si 



GO 

 (TO 

 OO 



+ 



-M 



rt 



CM 



O 





^ 





+ I 



GO 



CO 

 1—1 



UO ^ -= 



rM 



O 

 CO 



^ 



t-r( 



O 



CO 



+ 





i>? 



o 



GO 

 CO 

 OO 



H 



X -S 



CQ 



^ 



03 



o 



o 



;2i 



f^l 



