from the measurement of an arc of the meridian , &c. 503 
Let / = i6°34' 42 " . . m = 60512,78 
7 = 47 30 46 . . m' == 60779 . . 
m' — m = 266,22 
Log. m = 4,7818471 
log. (Sin. 2 7 ) = 1,7354392 
4,5172463 . . nat. no. = 32903,8 
Log. m/= 4,7837536 
log. (Sin. 2 /) = 2,9106824 
8,6944360 . . nat. no. . . 4948,1 
Hence e = 
266,22 
83867,1 
Whence the mean of 
1 
3*S>°3 
%7955>7 
8 
83867,1 
1 
3i5,°3 
; or the 
309,15 
305,73 » 306,7 
mean compression deduced from ttie mean degrees given by 
these three sections, compared with the French measure. 
If we proceed in the same manner with the English and 
Swedish measures, we shall have by the whole as follows : 
By the French ; mean 
By the English 
By the Swedish 
315,03 
1 ' 1 . 1 
310,28 ’ 311,36 ’ 318,97 
111 
305,14 5 305,72 9 310,72 » 
mean 
mean 
309,15 
1 
313,5+ 
307,19 
And the mean of the three means equal == — ™ 
* 309,90 310,00 
nearly for the compression at the poles, as deduced from 
these comparisons ; which compression will be adopted for 
computing the different degrees from the equator to the pole. 
All this is supposing the earth to be an ellipsoid. But that 
