6j6 The Account of a 



determinations ; from which, and the above, we have the follow- 

 ing comparisons : 



Degrees. Time. 



Latitude <f observed 5 l0 4S' 39">5 Longitude west f i» 15' 22",$ 5 m i\5 



\ computed 51 45 38,0 from Greenwich. \ 1 15 29,2 51 ,9 



I conclude this article with expressing an opinion, that the 

 coincidence between the computed and, no doubt, accurately 

 observed longitude of this Observatory, affords strong reason 

 for supposing, that the operations at Beachy Head and Dunnose, 

 in 1794, for finding the length of a degree of a great circle 

 perpendicular to the meridian on the earth's surface, were made 

 with the required accuracy. 



SECTION THIRD. 



Trigonometrical Surveys of the Northern and Western Parts of 

 Kent, the County of Essex, and Parts of the adjoining Counties, 

 Suffolk and Hertford, executed in the Tears 1798 and 1799. 

 (See Plate XXXII. J 



It will be convenient to treat of the operations carried on in 

 the north of Kent and Essex, before we speak of those executed 

 in the western parts of the former county. 



In a former article I have observed, that from the old station 

 at Wrotham, (General Roy's,) the view towards the north is ob- 

 structed, and also that it became necessary to select a new one: 

 this station was found to be 205,5 feet from the other ; the dis- 

 tance was accurately measured, and afterwards the angle taken 

 at the old station, between the staff on Severndroog Tower, 



