DREDGING AND DREDGES 5 



removal of a certain kind of soil. In dredging, the greatest attention 

 should be given by engineers and contractors to the selection of 

 the machines, which should be the most efficient and economical 

 for the improvement under consideration. Such a selection, however, 

 should be the result of a thorough knowledge of both the various 

 excavating and transporting machines at their disposal, and the 

 kind of soil to be removed. 



