A TREATISE OX DREDGES AND DREDGING 



Channels: 



Deepening and widening channels through bays and rivers. 



Harbors : 



Cleaning out harbors. 

 Building new harbors. 

 Enlarging old harbors. 



Rivers: 



Straightening rivers. 



Removing obstructions, as sandbars, deposits of mud ; 



sawdust, etc. 

 Building dykes and levees. 



Canals and ditches: 

 Navigation. 

 Drainage. 

 Irrigation. 

 Power. 



Reservoirs and dams: 



Cleaning out debris and deposits of vegetable matter. 



Reclaiming : 

 Low ground. 



Filling behind bulkheads and piers. 

 Flooding land to dredge it. 



Mining I 



Gold from rivers. 



Gold from placer deposits. 



Platinum. 



Tin. 



Marl for cement industry. 



Clay for bricks and pottery. 



Phosphate rock for fertilizer. 



Sand: 



For building purposes. 

 For glass industry. 

 Magnetic sand. 



Gravel: 



For many purposes. 

 Foundation work. 



