TRANSPORTATION OF THE DEBRIS 



189 



The general construction of the pipe line and joints are illustrated in 

 Fig. 60, Cuts B, Cj and D. The ball end of the joint is solidly riveted 

 to the frames on the pipe, while the socket is fitted to slide in a 

 casing or frame, and its movement is resisted by springs as shown. 

 These springs are two in number and are heavy car springs. They 



FIG. 60. Pipe Line Conveyor of the Dredge " J. Israel Tarte." 



are 6J in. in diameter and 8 in. long and made of round steel 1J in. 

 in diameter. The springs are carried between spring-plates, resting 

 against stops in such a way that the springs are compressed for 

 either thrust or pull of the draw-bar, and the whole arrangement 

 is built of steel in the very strongest manner, and each joint is 

 strong enough vertically to carry half the entire weight of the pon- 

 toon upon it. In other words, should the entire buoyancy be removed 



