Smithsonian Report, 1916. — Harts. 



Plate 3. 



1. Mat Woven of Poles and Brush for Bank Protection on the Mississippi 

 River. This Mattress is Continuous, and is Built on the Scow Shown on 

 the Right. 



2. A Fleet of Coal Barges Passing Lock No. 2, Ohio River. The Movable 

 Dam is up and is Shown on the Left. 



