Bui. 316, U. S. Dept. of Agriculture. 



Plate VIII. 













. 



F-16787A 



Fig. 1.— The Mat as it n ears Completion, 1,000 Feet Long and 250 Feet Wide. 



F-16792A 



Fig. 2.— Sinking the Mat by Throwing Rock Ballast on It. 

 BANK-REVETMENT WORK. 



