CHAPTER XV 



HYDRAULIC DREDGES FOR CHANNELS AND RIVER 

 IMPROVEMENTS 



THE hydraulic dredges used in the improvements of harbors and 

 rivers usually discharge the dredged materials onto the nearby 

 lands by means of long floating discharge pipe. These dredges, 



FIG. 34. Dredge "J. Israel Tarte." 



according to Mr. Robinson, can be divided into three groups, 

 as follows: 



1st. Lateral feeding. 



2d. Forward feeding. 



3d. Radial feeding. 



Lateral Feeding. Possibly the only lateral-feeding hydraulic 

 dredge is the " J. Israel Tarte " designed by Mr. A. W. Robinson for 

 the improvement of the St. Lawrence River ship channel and 

 described by himself in a paper read before the Canadian Society 

 of Civil Engineers. 



The hull of the dredges, Fig. 34 and 35, is of steel and is 160 ft. 

 long, 42 ft. beam, 12 ft. 6 in. deep. The plating is J in. thick on the 

 bottom and f in. on the sides with &-in. deck. The hull is rounded 



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