180 



HYDROGRAPHICAL SURVEYING [chap. vi. 



Fig. 53 



,,~C>Corncr Ul 



bl liter J I 



•^Corner II 



6 Inter 1 



' I Breastmarh 

 Running" Survey with Beacons. 



...—Q Corner I 

 Beacon / 



Waiktr &-BoutttUs<, 



