82 



SMALL WATER SUPPLIES. 



do equally well on horizontal pumps as well as 

 vertical. 



FIG. 70. FIG. 71. 



For general purposes there is a pump which satis- 

 fies a great many conditions and is worthy of notice. 



It is known as the " Hat- 

 field " pump, and is made 

 by Messrs. Merry- 

 weather & Co., Green- 

 wich Road, London. It 

 is a very novel adapta- 

 tion of the three-throw 

 pump, and is illustrated 

 in figs. 73 and 74, from 

 which it will be seen 

 that there are three 

 pump barrels arranged 

 symmetrically round the 

 FlG - 72 ' shaft. They form part 



of a single gun-metal casting, in which also are 

 formed the valve chambers and passages. Each 

 pump piston is of comparatively large diameter, but 

 has a very short stroke. The advantage of this 

 unique arrangement is that the pump may run at a 

 high speed, if required up to 700 r.p.m. The valves 

 are a special form, made of india-rubber, with a very 

 large area and small lift. The pump is very well 



