4 SUBMAKINE CABLE LAYING AND BBPAIEING. 



device of the late Mr. Sherlock, chief engineer of the cable-ship 

 "Electra." On striking bottom the wire is slacked and the 



Knife 

 €ling Seat 



Fig. 2. — Silver town Sounding Tube. 



lever is free to fall at the weighted end. In doing so the hook 

 is raised and disengaged from the weight. 



In addition to the sinker the line usually carries a sounding 

 tube for bringing up specimens of the ocean bed and bottom 



