CHAP. XX.] 



SWEEPING BY BOATS 



445 



"'i/K 



42 yards Wire Sweep 



Fig. 102. 



Otter Sweep set at 6 fms. (Elevation) 

 Not drawn to Scale 



Fig. 103. 



separate to 45 yards apart, rise to and remain on (or within a 

 foot of) surface, thus keeping kites beneath them at proper 

 distance apart and 42 yards wire sweep taut at depth of 6 

 fathoms. 



If otters separate too widely, which can easily be seen by 



