150 UNDER-REGISTRATION OF METERS 



slowly increasing rate, the moving parts shall start to move 

 before this quantity is reached and thereafter at no point shall 

 the indicated quantity fall below the actual quantity by more 

 than the amount specified. Meters shall be subject to this 

 test at any temperature between 35 and 75 F." 



The number of gallons that could be specified per day will 

 have to be ascertained by practical experience. There is a 

 tendency at the present time to manufacture and sell an increas- 

 ing number of types of meters and of variations of old types 

 and with variations in the materials that are used, and some 

 such addition to the specifications and to the ordinary meter 

 tests is much needed. 



