334< Dow J* Rodriguez's Observations on the 
Between Clifton and Dunnose 2 0 50' 23", 35 
Clifton and Arbury 114 3 ,40 
Arbury and Dunnose 1 36 19 ,95 
The extent of the first arc, in linear measure, is 10363391- 
feet English, and when this is reduced to toises, we have for 
the lengths of the three arcs from Lieut. Col. Mudge’s mea- 
sures. 
From Clifton to Dunnose 162067,3 
Clifton to Arbury 70380,2 
Arbury to Dunnose 91687,1 
These last values exceed those resulting from my compu- 
tations, the first by 10 toises, the second by 2, the third by 8 
toises; and these differences arise from the convergence of 
the meridians, which the author thought might safely be neg- 
lected, and in fact it does not make a difference that is percep- 
tible in the value of a degree upon the meridian. For the 
difference of 8 toises, in the distance between Dunnose and 
Arbury, makes but 3 toises difference in the value of a degree 
upon that arc, and the difference of 10 in the whole distance 
from Dunnose to Clifton, makes 3^ in the measure of each 
degree on that arc. So that, as far as this source of disagree- 
ment is concerned, the author’s results and mine would not 
be found to differ materially from each other. 
But, if we attend to the angular dimensions of the several 
arcs, as deduced from observation and from calculation, these 
will not be found to agree so nearly. 
The following table will shew the differences in each m- 
. stance. 
