472 
The Account of a 
may be considered as the least exceptionable mode of pro- 
cedure, to deduce the intermediate heights from both those 
stations; for which purpose, the following comparison was 
made, exhibiting the height of the station on Charton Com- 
mon, both ways. 
Feet. 
Height of Nine Barrow Down (Phil. Trans. 1795, p. 582) 64,2 
of Black Down - - - 825 
of Charton Common, deduced from the height of 
Dunnose - 597 
Height of Butterton - - - - - 1201 
ofRippinTor - *545 
ofFurland - - - - 585 
of Haldon - - - - 811 
of Charton Common, deduced from the height of 
Maker - - - - 568 
from that of Dunnose 597 
difference 29 
Those are the heights resulting directly from the obser- 
vations. Now, supposing the difference, or the errors, to arise 
from the mean refractions, and those errors to be nearly the 
same between every two stations, we shall obtain the corrected 
heights in the following manner : 
Feet. 
Nine Barrow Down 6 42 — 4 = 638 
Black Down 825 — 8= 817 n 
Charton Common 
Butterton 
Rippin Tor 
Haldon 
Charton Common 
825 — 8 = 
597 — 1 5 = 582 
1201 -J- 2 = 1203 
1545 + 4 = *549 
811 + 7 = 818 
568 -J- 14 — 582 J 
> as in the table. 
