THE STEAM ENGINE. 



of its heat preparatory to being- once more put in circulation 

 through the machine. 



Another method of arranging a self-regulating feeder is shown 

 in fig. 5. A is a hollow ball of metal attached to the end of a 

 lever, whese fulcrum is at B. The other arm of the lever c is 

 connected with the stem of a spindle valve, communicating with a 



tube which receives water from the feeding cistern. Thus, when 

 the level of the water in the boiler subsides, the ball A prepon- 

 derating over the weight of the opposite arm, the lever falls, the 

 arm c rises and opens the valve, and admits the feeding water. 



