BuL. U. S. P.. F., 1 90S. 



Plate XCVII. 



Fig. 15. — I'ilter car, same as figure 14, plate xcvi. showiiio^ bucket chain in 

 operation. One of the buckets has just emptied itself and the stream of 

 water is faintly shown running into the trough. 



Fig. I'j. — Filter car with c.iii\as linin- Cliain buckets on lelt. The propeller blades 

 may be seen iu the water. 



