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 
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Fic. 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 are 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. 
