Bull. U. S. B. F., 1914. 



Plate LXXVIII. 



-IiilL-rior I'f Kciieral laburatury, showing alcove arranuemeiit and concrete tank tables. 



Fig. 7. — Three principal cast-iron pipe lines entering culvert beneath railway tracks. From left to right, the 4-inch clear-water 

 supply, the 14-inch (reducing to lo-inch) reservoir supply, and the return 8-inch pond supply. In the foreground a valve 

 box is seen; the valve controls an emergency "crossover" connection between reservoir supply and pond supply. (See 

 text, p. 39.^.) 



