the ‘Trigonometrical Operation . 
diding in died Into two fets. Firft, thofe which are perma- 
nently marked by pipes funk in the earth ; and, fecondly, 
thofe where the inftrument was elevated to the top of fome 
tower, church ft^eple, or other building. The plans of the 
platforms of this laid fet are given in Plate VIII. along 
with fuch dimenfions as are neceffary to fhew, with regard 
to the fide walls, the precife fpot over which the center 
of the inftrument was placed. As often as was poftible, thefe 
fituations were further defined, by means of concentric circles 
defcribed on the leads. 
The ftations of the firft fet, marked with pipes, are fourteen 
in number, viz . 
Hampton Poor-houfe, 
King’s Arbour, 
St. Ann’s Hill, 
Hundred Acres, 
Norwood? 
• 9 
Ruckinge, 
High Nook, 
Allington Knoll, 
Padlefworth, . 
{ 
* A ® 
Botley Hill, 
Wroth am Hill 
Hollingborn Hill, 
Fairlight Down, . 
the extremities of Hounflow Heath, 
bafe. 
about the middle on the eaft edge- 
near the weft end of the garden, 
towards the Croydon end of the heights, 
jin a field belonging to Limpsfield 
l .Lodge Farm. 
in a field belonging to Mr. Johnston. 
in a field belonging to Mr. Duppbr. 
4 7 feet fou th ward from the Windmill, 
which makes with Fairlight Church, 
an angle of 105° 20 7/ . 
f the extremities of the bafe of verifi- 
1 cation. 
f an artificial mount belonging to Sir 
l John Honeywood. 
i eaftward from the Church, in the 
Broom-field belonging to Mr. Brock- 
man. 
Folkftone 
