C 277 1 
The points B D E and M are in a right line. 
cb». jin- 
B D = 22 51, and the angle CDM = 86° 32,;/ 
nearly. Hence, 
B is fouth of D — 1 3% — D g. 
. , > m, ch, llo. 
The line A B ~ b 1 78 31, in which is one gentle 
riling hill, about half a mile over 5 all the red; of the 
line is an entire level or plain. 
Thefe rneafu rements, exprelled in Englilh flatute 
miles and parts of the fame, were made with a chain, 
effablifhed from a brals ftatute yard, which was 
proved and corrected, in the courfe of the work, by 
another ffatute chain (kept only for that purpofe) made 
from the faid brafs yard. They were only defigned 
for dividing the provinces of Maryland and Penlyl- 
vania: the fame lines were re-meafured afterwards 
with wooden rectangular levels, for the purpofe of 
determining the length of a degree of latitude, as will 
appear in the fequel of this work. 
The point C was placed in the parallel of latitude of 
P, thus. Let N (fee Tab. XIII. fig. 2.) reprefent the 
north pole of the terredrial globe 3 P and R two places 
lying in the fame parallel of latitude II C P 3 P R an 
arch of a great circles io 7 joining the faid points 3 and 
P N, R N two meridians. P N or the complement 
of the latitude of P being — 50° 16 7 42 /7 , the angle 
NPR or the azimuth of the great circle PR was 
found by calculation to be 89° 5 ^ 51 77 . The going 
of the clock being found by equal altitudes of Ears, 
the times were computed when the fame or other 
Ears would pafs the azimuth of the line P R3 and, at 
the time computed for any Ear, the interfeCfion of 
the crofs wires of the tranfit inErument being brought 
to 
