4 35 
Trigonometrical Survey. 
On a reference to the account of 1 795, it will be seen, that 
a station was chosen near Lulworth, and observed both from 
Nine Barrow Down and Black Down. It was also intended to 
be observed from Bull Barrow; by which means the great tri- 
angle, formed by the stations Black Down, Nine Barrow Down, 
and Bull Barrow, would be divided into, and made to consist 
of, two smaller triangles. This, however, it was now found could 
not be done, as a signal house had been erected near the station 
at Lulworth, subsequent to the operations in 1 794, which pre- 
vented that spot from being afterwards seen at Bull Barrow : 
but no consequences very injurious can have arisen from the 
impracticability of making use of this station in the manner 
originally proposed, since the stations formerly chosen in 
Portland, with which that of Lulworth was also intended to 
connect, have not been visited with the instrument. The sta- 
tions in that island were selected with a view of observing from 
them, and Charton Common, some point in the vicinity of 
Torbay, which might be a proper station in the series intended 
to be carried along the coast. Such a situation, however, could 
not be conveniently found, as the view of Devonshire' from 
Charton Common is much interrupted by trees and other 
obstacles ; and it would have been highly improper to shorten 
the side between Pilsden Hill and the coast, by choosing a 
station more remote from the latter than Charton Common. 
As from an inspection of the plan of the triangles annexed 
to this account, a doubt may be entertained as to the propriety 
of carrying on so very extensive a series from the short side 
connecting the stations on Black Down and Mintern Hill ; it 
must be observed that, admitting the necessity of adopting Bull 
Barrow for a station, those on Pilsden and Mintern Hills were 
mdccxcvii. 3 L 
