„„, exceeding one degree in extent, «hen 



A a«-^--»""^"° fal will produce an are. by care- 



.ecuratelydrawrronaplanefurhc , P^^ ^,^^^ .^ ^^^ „^^ 



U .enfuration ^'^'^'^l^^^'J Zr therefore being in-m- 

 i„ true extent on the fphe«. ^^._^^^, ^^^^ „„ , fe 



.erial, delineate each -^f^^ ^„„„„ „„ throngh it «.th 



parate paper, and 1-ng ^ »" p.,„, direded above, and 



g,eat eare and accuracy, ..eu ^^^^ ^ ^^^^^^ ^^^, 



If the fum of the areas «f"'""8 ^„„fl,„,, .. free from ma- 



.hat in the table, the op-™" "^ J^ ^ .^^^ ,„ft be proportionally 

 „r,a, errors . *= f-U d.fter.nce *- ^^^,^,^^^,, ^^^^ ,,^ ,, 



aivided -'-«" *;j;" ° eonfrftent, and the numbers thu. 



>frea 



