88 



A TREATISE ON DREDGES AND DREDGING 



gantry, permitting it to be raised to 20 ft. above water or adjusted 

 to any lower elevation. The latter scow may be swung at any angle 

 to deposit the debris on either side of the river without disturbing 

 the rest of the plant; or it may be attached directly to the dredge 

 and used without the intermediate scows, which at first seemed a 

 difficult problem to solve. The complete plant carries the spoil 

 300 ft. from the point of digging, and this distance is limited only 

 by the number and length of the conveyors used. The conveyors 

 are of the Ridgway type, but are protected on the sides and bottom 

 to prevent spilling; the belt is rubber, 32 in. wide, and will easily 

 convey the full delivery of the dredge. 



FIG. 23. Dredging Plant Used on the Fox River, Wis. 



The bucket chain of the dredge is driven by a 9X12 in. double 

 reversing engine through gearing which also operates the ladder- 

 hoist drum. A six-drum winch, driven by a 6X6 in. double engine, 

 is also provided for operating anchor, spud lines, etc. A walking 

 spud, operated by a steam cylinder, is provided to move the dredge 

 forward. The belt conveyors on the dredge and scows are operated 

 by electric motors supplied by a 35-KW. electric generator on the 

 dredge directly connected with a 10 X 10 in. engine, which also furnishes 

 electric lights for the plant and power for operating a 6-in. spray 

 pump for cleaning the belts. Steam is furnished by a Scotch marine 

 boiler 9 ft. diameter, 10 ft. long, water-back type, with two Adamson 

 furnaces 35 in. in diameter. 



The delivery scow is provided with a winch operated by an 

 electric motor, for handling the anchor lines, gantry and spud. 



