Bui. U.S. B. F., 1917-18. PLATE XXVIII. 
Fic. 1.—Barge with long crowfoot bars, employed on the Ohio River. Note rollers set on ends of bars to facilitate movement 
over the bottom. (See p. sr.) 
Fic. 2.—Lowering the crowfoot bar into the water, Ohio River. (See p. 51.) 
