[ 556 ] 
Log. 0.87266C0 (= co°to radius 1) — 1.94.084.7# 
Log. MF (fin. 35°) — i- 73 8 39*3 
Log. MT (tang, 55 0 ) 0.1547732 
Take the fum — 1 .8 542 1 2 1 
from log. N« (= .6923772) .... — 1.8403427 
the remainder — 1.986130 6 
is the logarithm of C.v. And becaufe 1: 
Cx : : MT : xA, to this adding the log. MT o. 1 54773 2 
The fum 0.1409038 
is the log. of xt = 1.383260 j and R (= xr = 
| L l) being .4363325, R* will be 0.9469275, rt 
— 1.8195925. Whence having fixed upon any con- 
venient fize for our map, the center t is eafily found. 
As, allowing an inch to a degree of a great circle, 
or 50 inches to the line Rr, R^ the femidiameter of 
the leaft parallel will be 54.255 inches, and that of 
the greateft parallel 104.255 inches. 
Again, making as radius to MF fo the longitude 
iio° to the angle S/V, that angle will be 63° 5'-^. 
Divide the meridians and parallels, and finifh the 
map as ufual. 
Note , The log. MT being repeated in this com- 
putation with a contrary fign, we may find a: t 
immediately by fubtrading the fum of the loga- 
rithms of L / and MF from the log. of N n. 
VI. A map drawn by this rule will have the fol- 
lowing properties : 
1 . The interfedions of the meridians and parallels 
will be redan gular. 
2. The 
