WATER-METER 



1097 



2095 



German silver bush P. Q is a screw attached to the top of the drum spindle, for the 

 purpose of giving motion to the -wheels of dial-work, and so indicating on a graduated 

 dial the number of feet or gallons of water passed through the meter. E is the 

 dial work, s s is an oil chamber, which is for the purpose 

 of lubricating and protecting the wheels of the dial-work 

 from the action of the water, and so preventing any 

 foreign substance getting upon and injuring them. T is 

 the dial-plate, used for the purpose of making, along with 

 the india-rubber washer v, a sealed or water-tight joint 

 between the oil chamber, -where the bottom wheels work, 

 and the upper portion or chamber, where the top or 

 differential wheels and dial work, v is a dial-cap, screwed 

 on to the top of meter-case. TV is a glass plate, covering 

 dial, x is an outside metal-case, in which the drum revolves. 

 Y is a bottom plate, for putting in and taking out the drum. 

 The annexed drawing, Jig. 2096, shows the arrangement 

 of the meters to measure large quantities of water in con- 

 nection with town supply or district mains. The plan 

 shown admits of the regular and periodical examination 



2096 



2097 



and repairs, when necessary, without in- 

 terfering with the constant supply. A 

 dirt box is attached to each end of the 

 meters, so as to protect them from in- 

 jury arising from anything (such as 

 sticks, stones, shells, &c.) which might 

 be in the pipes, and which if allowed 

 to pass might, without this precaution, 

 destroy the accuracy of the measure- 

 ment, and damage the meter. The 

 sluice valve at each end provides for 

 the periodical examination of the meter 

 and cleaning the dirt box, and when 



