38 W. & L. E. GURLEY, TROY, NEW YORK 



Rating Table for Use with 



Electric Current Meters, Nos. 617, 621 and 623 



Thin Table is baaed on the ratings of many meters. The comparison of the rating 

 of metrr No. 623, both penta recording and single count contact, show an agreement 

 Huh this table within one percent. Occasional ratings vary more than one per < < nt . 

 when an individual rating table may be prepared. 



[Extract from instructions given by the Water Resources Branch of the l ? mtl 

 Slates Geological Survey to their Hydraulic Engineers.] 



