Trigonometrical Survey. 
5*7 
art. v. Table, containing a Comparison between the Degrees upon the 
Meridian, which have been measured in different Latitudes, with 
those computed on three Ellipsoids whose Magnitudes have been de- 
termined by data applied to the Conclusions derived from the forego- 
ing Problem. 
1st. Ellipsoid. 
2d. Ellipsoid. 
3d. Ellipsoid. 
Deg. on meridian in lat. 50° 41' 
60851 
fath. 
60870 
60851 
Deg. perp. to meridian 
61182 
61182 
61191 
Lat. 
« / 
Measured 
Fath. 
Com- 
puted. 
Diff. 
Com- 
puted. 
Diff. 
Com- 
puted. 
Diff. 
Bouguer, &c. - - 
O O 
60482 
60122 
— 360 
60183 
“ 2 99 
60103 
-379 
Mason and Dixon - 
39 12 
60628 
60607 
— 21 
60640 
+ I 2 
60600 
— 28 
Boscovich, &c. 
43 0 
60725 
60687 
-38 
60716 
- 9 
60683 
— 42 
Cassini 
45 0 
60778 
60730 
-48 
60756 
— 22 
60727 
-51 
Leisganig 
4 8 43 
60839 
60806 
- 3 ° 
60831 
— 8 
60808 
- 3 1 
Betw. Green, and Paris 
51 41 
6085 I 
6085 I 
0 
60870 
+ l 9 
60851 
0 
Maupertuis, &c. - 
60 20 
61194 
1 6l 148 
- 46 
61150 
-44 
61156 
-38 
The contents of the above table are computed from the data 
expressed in the different columns at top. In the third column, 
60851 fathoms is nearly the length of the degree upon the meri- 
dian, as derived by the application of the measured arc between 
Greenwich and Paris to the difference of latitude, namely, 
26". The fifth, contains the degrees on an ellipsoid, computed 
from a different length of a degree upon the meridian in lat. 50° 
41', in order to show how far the varying the length of that de- 
gree, will affect the comparison between the measured and com- 
puted degrees on the first ellipsoid : and those in the seventh are 
determined by using 60851 fathoms for the degree upon the 
meridian, and 61191 fathoms for that of the great circle per- 
pendicular to it ; which last degree is obtained by taking the 
angle at Dunnose, equal to 8i° 56' 53", 5, instead of 8i° 56' 53". 
Now this comparison between the measured and computed 
degrees, sufficiently proves that the earth is not an ellipsoid, 
3 y 2 
