Mr. Dalby’s De Auction of the 
been made exact enough), it will be eafy to reconcile mod of 
the refuks'to an ellipfoid. 
The following computations of the longitude are made on a 
fuppofition, that the earth is an ellipfoid, for the purpoi'e of 
comparing the cohclufions with what has been inferred from 
obfervation. It will be been, that the ratio of the axes comes 
out very near the ratio afligned by Sir Isaac Newton-, or 229. 
to zp. it is determined of fuch a magnitude, by adheringl 
nearly to the meafured arc of the meridian between Green- 
wich and Paris, deduced from the late operation, that the 
computed meridional degrees differ but little from the meafured 
ones in five different places in middle latitudes; but the defefts 
at the equator and polar circle are fuppofed to be nearly equal 
to each other. This will be feen better by the following com- 
parative view of the meafured and computed degrees in the 
lame latitudes. 
According to 
LaU 
Meafured* 
Com- 
puted. 
j Uxcefs or dc* 
fefl in men* 
0 i 
Fath. 
Fath. 
fured arc. / 
COND AMINE, &c. 
O O 
60481 
60344 
+ 137 
Mason and Dixon, 
39 12 
60628 
60682 
- 54 
Doscovich, ScC. 
43 0 
60725 
60738 
~ *3 
Cassini, &c. 
45 0 
60778 
60768 
-I* 1 1 o 
LlESGANIG'" , 
1 
48 43 
- Arc from latitude ") 
60839 
I. 
, 60823 
4- 16 
French and Englijbl 
48° 50' 14" to 
L 5i°>8 / 4 o // J 
160656 
1 
160662 
- 6 
Maupertuis, &c. 
66 20 
61194 
61057 
+ i 37 
In the five companions, from latitude 39° 12' to Green- 
wich, the greateft error (54 fathoms) anfwers to about 3" 0 
the celeftial arc : neither of the other four differences amounts 
* From the late Gen. Roy’s Paper in the Phil. Tranf. 1787. 
ti 
