CHAP. XX r] SCHEME OF TRIANGULATION 



513 



Outer Dowsing It. VI. 

 ^^ (g Lt. Gp. Fl. eu. 30 sec. Vis. 11 m. 

 ~^ Assistant from X 1st. evening 



Dudgeon Lt. VI 

 Lt.Alt. Gp.FI. eu. 30 secf*\yis. 

 Assistant from Y Jst. ei 



Perch 

 HadXSnd.jiuenrng 



Haisboro Lt.VI. 

 Lt. Gp.FI. eu. 30 sec. 

 Vis. 11m. 

 Stan t from Z Isteuening 



Haisboro\Lt.Ho. 

 Lt. Occ. ek 30 sec. Vis. 11m, 

 Not \laited 



f"ig. IV. — Illustrating a Floating Triangulation connected to the Shore 

 Objects, where it is desired to fix the Positions of the Lightvessels in 



add.tion to examining the Area covered by the Beacons, The Co-ordinates 

 of the Shore Objects are known. 



Three vessels, X, Y, Z, engaged during two successive evenings and one day. 

 X tlie controlling vessel. 



33 



