Trigonometrical Survey. 





68 9 



Names of Stations. 



Observed 

 angles. 



Distances. 





Gravesend - 



Hornchurch - - - 



Purfleet Cliff Station 



O / « 



24 3 2 3° 

 31 26 22 



| Purfleet Cliff 



{ 



Feet. 



35517 

 28282 



Severndroog Tower 

 Hornchurch - - 

 Staircase of Barking Steeple 



39 44 2 

 27 16 44 



J> Barking 



{ 



253 8 3 



354°4 



Severndroog Tower 

 St, Paul's - 

 Westham Steeple 



39 41 6 

 44 '5 27 



> Westham - » 



{ 



28046 

 25662 



Art. xxxix. Secondary Triangles. 



St. Paul's from Severndroog Tower 39962 feet. 



Severndroog Tower 



St. Paul's -.. - 



Limebouse Steeple 



13 1 



22 36 



7 

 »3 



j>Limehouse 



{ 



26371 

 15456 



Severndroog Tower 

 Highbeech - 

 Cbigwell Steeple 



9 '5 3° 

 32 3 6 38 



| Chigwell 



{ 



57757 

 17242 



Severndroog Tower 

 Frierning - 

 Billericay Chapel 



11 57 



74 34 



6 



30 



f Billericay 



{ 



IOOIIO 



21506 



Westham Steeple 



Staircase of Barking Steeple - 



Station on Bank of the Thames 



45 58 

 68 35 











1 Station 



{ 



15640 

 12077 



Station on Bank of the Thames 

 Westham Steeple 

 Perry's Mast Bouse 



41 21 



56 15 





 



^Perry's Mast House 



{ 



I3IZO 



10424 



Hornchurch - 

 Staircase of Barking Steeple 

 Chimney of Public House at Bark- 

 ing Creek 



H 3* 



68 52 



20 

 



> Chimney 



{ 



33236 

 9005 



Purfleet Cliff 

 Hornchurch 

 Guzzard Station 



54 57 

 46 40 











[Guzzard 



{ 



21002 



23638 



