6>8 



The Account of a 



The distances of Gadshill from Halstow, and from Halstow to the Isle of Sheppey, in 

 the following triangle, viz. 



Halstow 128 34. 28 



Sheppey 18 18 3 



Gadshill give the distances between Gadshill and the station 



in the Isle of Sheppey 70687 and 70685 feet : the mean, 70686 feet, may be taken for 

 the true distance. 



Names of station*. 



Observed 

 angles. 



Distances. 



Hadleigh 

 Southend 

 Sheppey 



or* 



38 43 29 



119 ZO 5 



> Southend - - - < 



27596 

 46204 



I22 c 



2' 



4°" 



. 64 56 



H 



III 



20 



H 



6l 



40 



46 



To find the distance between Langdon Hill and the spindle of the weather-cock on 

 Rayleigh Steeple, we have the following quadrilateral. 

 Langdon Hill 

 Gravesend « 

 Halstow 

 Rayleigh 



360 o o, which gives the distance from the centre of 

 Rayleigh Steeple to the staff on Langdon Hill — 441 31 feet; but the point on the top 

 of Rayleigh Tower, over which the instrument was placed, was just 7 feet farther from 

 Langdon Hill than the spindle; therefore, 44131 ■+■ 7 — 44138 feet, is the distance 

 between Langdon Hill and the station on the steeple. — The angles in the following tri- 

 angles, 



I34 u »'55" 

 16 26 30 



Hadleigh 

 Sheppey 

 Langdon Hill 



Langdon Hill 49 8 5 



Sheppey - 27 4 46 



Rayleigb give the distance of 



the Spindle on Rayleigh Tower from j Ha'dfefh "'" = ? 4 ' V } Feet * 

 From the preceding quadrilateral, the distance between the spindle on Rayleigh Tower 

 and the station on Langdon Hill, was found — 441 31 feet, which is the same as the 

 other determination. 





