TRANSPORTATION OF THE DEBRIS 



199 



The manner of operating this apparatus is very simple. The boat 

 loaded with the dredged materials approaches the machine, the 

 ladder is lowered so as to dig into the debris, the engine is then 

 started, and the material picked up by the buckets ascends the 

 ladder and in revolving around the upper tumbler drops into a 

 chute. The machine may be either firmly mounted on a scaffold 

 made up of heavy timber beams and located at some convenient 

 point along the river shores, as in Fig. 68, or it may be mounted 

 on a platform of a railroad car and moved along tracks placed 



FIG. 68. Bucket Elevator for Unloading Barges. 



along the shores. In the former case the material when dumped 

 from the buckets into the chute enter into bins and from them is 

 discharged by gravity into cars and thus sent to its final destination. 

 With the other method material from the chute is dumped directly 

 onto the ground which is to be filled up. In this case, it is necessary 

 to use a high tower so as to extend the chute in order to dump the 

 material at more distant points. 



Sometimes, especially when close to the shores, the river or 

 canal is very shallow and a loaded scow could not safely navigate 

 there; the elevators are then mounted on floats. Then the ladder 



