86 A TREATISE ON DREDGING AND DREDGES 



Following is the description of a stationary ladder dredge of 

 American construction, a striking feature being that the excavated 

 materials are conveyed to the shore by means of an endless belt 

 conveyor. This machine was used on Fox River, Wis. and was 

 described by Mr. L. M. Mann, the engineer in charge, in the 

 Engineering News, October 25, 1906. 



The plant as illustrated in Figs. 22 and 23 consists of a dredge 

 with two intermediate and one delivering scow. The dredge is a 

 regular elevator or chain-bucket dredge, having a chain of 39 



FIG. 21. Stationary Ladder Dredge. 



buckets of 5 cu.ft. capacity each rolling over a steel ladder. These 

 buckets are provided with steel teeth for cutting up clay and digging 

 the hardest material, and may be set to dig at any desired depth up 

 to 10 ft. The dredge swings on a stern spud amidship, allowing 

 it to dig on a circle of about 80 ft. radius, covering a width of channel 

 of about 145 ft. 



The material, on leaving the elevator buckets at the top of the 

 ladder, is deposited in a hopper and passes thence onto a belt con- 

 veyor which conveys it aft over the stern of the dredge and delivers 

 it into another hopper in the forward end of the intermediate or 

 delivery scow. These several scows are provided with belt con- 

 veyors which keep the material in continuous motion until it is 

 finally deposited where desired, either on shore or in a dump 

 scow. The conveyor on this scow projects by means of a steel 

 ladder over the stern a distance of 40 ft., and is hung from a 



