ROUCII-AND-TL'MBLE ENGINEEK 33 



or 1. check by opening the little drain cock. If 



the water which goes out through it is cold, the trouble 

 check; but, if hot water and steam 

 iin cock, the trouble 

 the 1 >nc next .oiler. 



icver be tampered with without first tin: 

 cock between it and the boiler. The valve can 

 1 the obstruction removed. Be very 

 il never to take out the hot water check without 

 :ig the stop cock, for if you do you will get badly 

 tart the pump without opening this 

 . for if you do, it will burst the pump. 



The obstruction under the II sometimes bar 



find. southern Iowa got k'idly fooled 



little pebble about the size of a pea, which got 



when he started his pump the pebble would 



be forced up under the check and let the water back. 



:i he took the check out the pebble was not there, for 



1 dropped back into the pipe. You will see that it is 



necessary to make a careful examination, and not get 



k up a wrench and w: ay at the check 



so that it will not work. Remember 



ould, and make up your mind to 



don't work. A few years ago I 



1 miles to see an engine on which the pump 



won; >rk. The engine had been idle for two 



