LARGE HAND PUMPS 



95 



Horizontal Pumps 



Horizontal hand pumps are typically of the double-action type, and 

 have a capacity of 3 to 5 gallons of spray material per minute. They 

 have a marked advantage over barrel pumps in that the handle is longer 



Fig. 61. — A convenient tower used in connection with a barrel pump. Original. 



and works in such position that the operator can maintain the desired 

 pressure and volume with much less effort. They do not bring the 

 constant strain on the muscles of the back, characteristic of barrel 

 pumps, and since they arc double acting, both the forward and the 

 reverse strokes count. In efficiency, pumps of this type are nearly 

 the equivalent of the smaller power outfits. 



