in the length of the pendulum vibrating seconds. 391 
294 feet north of the spot where my observations for latitude 
were made. At this station the oblique angle between 
Cowhythe and Knock Hill was observed by four repetitions 
to be - - - 11 7°.56 , .5 o /, ,44 
The zenith distance of Cowhythe - 88. 38. 40 
of Knock Hill - 83. 8. 51 
Whence the angle between Cowhythe and Knock Hill, re- 
duced to the horizon, is - - ii8.°2i / .35",64 
Cor. for the excentricity of the telescope -{- 1, 70 
True horizontal angle - 118.21.37,34 
The station at Cowhythe is marked by a conical mass of 
masonry, which obliged me to place the instrument at the 
distance of eight feet from its centre, in the direction of Portsoy 
Hill. 
The oblique angle at this spot between Knock Hill and 
Portsoy Hill, was - 54°.23'. 3" 
The zenith distance of Knock Hill - - 88. 30. 25 
- ■ of Portsoy Hill - 91. 23. 30 
Hence the angle between Knock Hill and Portsoy Hill, reduced 
to the horizon, is - 54 °.i8 , .49 /# 
Reduction to the centre of the station - - — 31,5 
Cor. for the excentricity of the telescope — 1,7 
True horizontal angle - 54. 18. 15,8 
The distance from Cowhythe to Knock Hill, by the trigo- 
nometrical survey, is 42633 feet, Knock Hill being to the 
south west 3i°=57'.8 // . We have then the following triangle 
to determine the distance from Cowhythe to Portsoy Hill : 
