252 
Methods of Preventing and Checking 
now, as it is most importaut to get all the hop plants washea 
in a veiy short time when the aphides appear. The smaller 
machine requires one horse. By the horse machine the 
Tig. 23. —A i.i .1 i;. was'.iiiig lUi -Uiuc. 
various washes are forced by strong pumps set in action by the 
wheels, through a series of tubes arranged with mathematical 
Fk!. 24.— The "MUtificr." 
precision on each side of the machine, having small perforations 
at regular intervals, serving as jets or nozzles. 
The machine shown in tlie figure (23) above is made in several 
