FLUSHING 



215 



the longer leg, being so balanced that when nearly full its 

 centre of gravity is brought forward and a portion of the con- 

 tained water poured out. As the water had previously risen 

 in the outside reservoir to a height above the lower bend of the 

 siphon equal to the depth of water in the trap, the sudden 

 change of level in the latter causes the longer leg to be imme- 



FIG. 61. 



diately filled with a stream under about 4 inches head, so that 

 the siphonic action commences at once without waste of water." 



The siphon-tank was invented by Mr. Field, so far as its 

 present form is concerned, was afterwards improved by Col. 

 Waring, and is known as the " Field-Waring Tank." The 

 following description, together with a sectional drawing, is taken 

 from the circular (see Fig. 62). 



" The siphon invented and patented by Rogers Field and 

 improved by Col. George E. Waring, Jr., consists (in the form 



