PUMPS AND ACCUMULATORS. 



61 



the water released and allowed to flow back to the supply 

 tank. The pumps are usually driven by Dower transmitted 

 by belts from the line shafting, though in some cases the 

 pumping can be, and is, effected by manual labour. In 



the case of belt-driven pumps, the belt fork is provided 

 with a tappet rod, so arranged that when the accumulator 

 load reaches the top of its stroke, it engages with one of 

 the tappets and thus throws the belt on to the loose pulley, 



