propojed trigonometrical Operation, j ( 
Capital, we lhould ftill have been obliged to make ufe of the 
two ftations of Norwood and Shooter’s-hill, without procuring 
fo good an interfe&ion of Bottle-hill, called in the common 
maps (I believe erroneoufly) Botley-hill, as is obtained bv 
means of the ftation at the H undred-acre-houle. But although 
none of the fhitions of the feries actually fall within London, ne- 
vertheless, from thofe in its vicinity, viz. the Pagoda, Norwood, 
Greenwich Obfervatory, and Shooter’s-hill, we {hall equally 
have it in our power to determine accurately the fituations of 
Harrow, Hampftead, and St. Paul’s, as well as many other 
chief fteeples within the limits of the Capital. 
Another principle I have endeavoured to adhere to, in the 
difpolition of the triangles, is this, that, after having obtained 
fides in length from iz to 18 miles, I continue them at that 
length as much as the circumftances will permit ; for, if they 
came to be reduced conhderably below that extent, the obvious- 
advantages of a long bale at the outfet would be loft, bv the 
fnbfequent contra&ion towards the clofe of the operation. 
The tower of Tenterden church, being a very confpicuous* 
object, may be feen every where from the fummit of the chalk 
hills, as far weft as the river Medway. It likewife may be feen 
from the eaftern extremity of the fecond bafe, whereby the. 
laft triangle,. ’Tenterden , Lid , Allington Knoll , is propofe’d to 
be verified. This knoll is itlelf a very remarkable objefl, 
more acceftible, and in other refpects more proper too for the 
purpofe of a ftation than Lymne church fteeple, which I had 
at one time thoughts of occupying. The high ground which 
feparates Romney-marfh from the Wealds of Kent, pafles 
immediately behind Ruckinge , that is to fay, to the north- 
weftward of it, and may therefore probably prevent the top of 
the chalk hills from being feen from the weft end of the bafe 
7 o£ 
