' I 



NT METERS 



.in. I the distance (Figs. 12 and 13). The revolutions per 

 second and the velocity in feet JMT second are afterward com* 



IMitr.l it.. 111 ill.- .l.ii.i. \I.m\ run* are made, the speeds vary- 

 ing from the least which will cause the wli--l i<> r.-\..Ue to 

 several feet per second. The results of these runs, when plotted 



\\i\\i K-M.lut .ui.l \>-l.H it\ in feet per second as 



co-ordinate*, locate tin- |nit- \%ln. )i .l.-tm.- the meter rating 

 . ui\. 1 1. mi \%ln,-h tin- rating t.ihlr in prepared. 



IIIIIII|HT of rr\<liition* of thr inrirr wheel are indicated 

 n electric recorder; the distance is obtained by an electrical 

 mech.ii 1 1 -m. \\lii. h i- in . 11. mi \Mtli the meter wheel, so that 

 the e\.i i -i i-tance for a given number of revolutions is obtained; 

 .IM.I ill'- linn- i- Liken h\ a t hronograph or a stop-watch, nlii.li 

 is started and stopped by means of an electrical control. 



Long exp. -iit -lire has shown that with good care meters do 

 imt readily lose their adjustment. \\ lu-n used carefully, 

 day, in ..i.l i nan- service, a meter should be rated once in three 

 months as a chnk. Meters in similar service, but used less 

 i ir.|n. ntK. -h"iilil be rated once a year as a check. For special 

 work the meter should be rated before beginning and as fre- 

 quently as may be necessary during the work. 



Fio. 13. < urn-tit : Ultut Station of Irrientkon Branch. 



Hlian Interior Department. 



