276 AN ACCOUNT OF THE 
Account of the Stations, at which the foregoing Angles were observed, 
and details necessary for their reduction to the centre of the Station. 
‘THE greatest part of these stations are either on rising grounds or on 
the summits of peaks, Indeed there are but four out of 17, which are on 
the low grounds. The signals used were, in the Dim, and where other 
objects did not offer, pyramidal frames of wood covered with cloth. These 
when projected on a dark ground, are very distinguishable, and can on 
account of the sharpness of their summits he intersected, with the greatest 
nicety. Their axis were set truly perpendicular by means of a plummet 
and wedges driven underneath them. This plummet was also made to 
coincide with the centre of the,station, and the signal then fixed by driving 
in- strong pickets to which it was lashed. For two stations, ‘the northern 
and southern extremities of the base, a flag staff was used and after conclu- 
ding the angles in the Din, this flag staff was erected at the connecting 
station in the Dun, in order that it might be more distinguishable from the 
mountains. ‘The other objects observed were various as will be seen in the ' 
following account of the stations. I shall give also the reduction of the 
observed angles, to the true, as referred to the centres of the several stations. 
Ist Station, Southern Extremity of Base. 
A Larce picket was driven in to mark this station, The signal was 
placed immediately over it as also the circle in oberving. ‘There are 
therefore no reductions to be made, 
