274 



GENEKAL SCIENCE 



FIG. 172. Dial of a water meter. 



opposite the house 

 or in a man-hole 

 under ground in 

 front of the house. 

 Accuracy of 

 Meters. It is 

 very rare that a 

 water meter over- 

 registers. Any 

 disarrangement of 

 the meter from 

 dirt entering the 



working parts usually 

 slows the meter down 

 and causes it to un- 

 der-register. There 

 is also a small amount 

 of unavoidable leak- 

 age which causes the 

 meter to under-reg- 

 ister. Meters reg- 

 ister in cubic feet 

 or in gallons. One 

 cubic foot is taken 

 commercially as equal 

 to 7J gallons. 



Determination of 

 the Amount of Water 

 Required for Any Ap- 

 pliance. One may 

 determine the amount 

 of water required for 

 watering a lawn by 

 turning on the water, 

 and allowing the hose 

 to run one-half hour, 



FIG. 173. Dial of a water meter. 



