[ SI2 1 
the obfervatory had been ufed as an objedl in taking 
angles by the theodolite, in the lurvey of the hill. 
While I was engaged in thefe aftronomical obfervations, 
Mr. BURROW, attended by Mr. william menzies, a land- 
fnrveyor living in the neighbourhood, who had been re- 
commended by fome of the principal gentlemen of the 
country, as a proper perfon for this work, went out every 
day that the weather permitted, to take fediions of the 
hill, and angles between feveral objects, for determining 
the figure and dimenfions of the hill. The method made 
life of was this, which was propofed by Mr. burrow, 
and was well adapted to the purpofe. A number of Ita- 
tion poles were fet up at convenient di fiances all round 
the foot of Schehallien ; but rather without its bafe, and., 
chiefly on little eminences rifing from the foot of it, 
which formed a polygon of many fides, furrounding the 
hill; and when delineated on paper, fliew very nearly 
the fhape of its bafe. At each ftation, the angular pofi- 
tion of two or more of the other ftations being obferved. 
with the theodolite, and one- fide being determined by 
means of a meafured bafe, all the other fides will be 
known. From thefe ftations, fedfions of the hill up to 
the top? were taken in the following manner. The the- 
odolite, being placed at any ftation, was pointed towards 
the hill; and a labourer was fent with a number of poles, 
which he was to plant in the ground truly upright, at 
regular diftances and in a vertical plane, according to 
fignals which he received from the perfon that ftood at 
the theodolite, who alfo took the altitude of the foot of 
each 
