THE SIZE OF THE EARTH. 



17 



2 



gi 





-* r-j o o o> o <M T-H io i i o p cq CM o 



CO <M 00 CO t^ O i ' r-H i < O -^ O *O C5 O* 



^GOCCCOO^OCi O t-^005 CO OOr-H 



lOiO^O^OiO^OtC^ -* CO CO <M CO ^^ 



i^COCO^OtOOOCO CO COCO^O CO COCO 



COCQCOCOCOCOCOCO CO COCOCO CO COCO 



11 



05 o o as co" r^ co co" 



I-H CO <M C^ id *O r- 1 CM 



c o c co 



COiO COCO iO 4 O 

 i lOOOi-Hr-H(MCOC<l 



T-HOO 

 i O r-l CO rHCO 



Geographical latitude 

 of the middle of the 

 measured arc. 



Ob-^cdco'coidci CM O'-'O o" oo 



i-H^^H <M(M CO<M 



<MD<M r-i OQCO 

 rH COCOf-l"* 



(Mr-H 



COCO 



OiCO5<1 i-t 

 CO'''' COCO 



l 



ll 



a 







VOL. Y, 



