192 U. S. COAST AND GEODETIC SURVEY. 



Table 12. — Log factor F corresponding to every tenth of a degree of I. 



*Log F of X2, ti2, "2, MS, 2SM, and MSf are each equal to log F of Ms. 

 Log\Fof Pi, R2, Si, Sj, S4, Ss, Ti, Sa, and Ssa are each zero. 

 For log F of L2 and Mi see Table 13. 



