324 ENGINE TESTS. 



mainly in that part of the pipe which lies between the reservoir 

 and the cylinder, and the reservoir serves to prevent them to a 

 large extent from extending back to the boiler. The steam- 

 pipe diagrams here given show the desirability of employing 

 some means for reducing the extent of these fluctuations, and 

 in one instance the beneficial effect of a reservoir is clearly 

 revealed. 



