New York Agricultural Experiment Station. 367 



Sometimes barrel or tank sprinklers are used. These may be 

 mounted on a two-wheeled cart and connected at the rear with pipes 

 having one or more nozzles for each row. No pump is used, the 

 liquid being distributed only by force of gravity. They are compara- 

 tively inefficient since the force is not sufficient to make the most de- 

 sirable kind of spray. 



A modification of this type of apparatus consists of the substitu- 

 tion of a geared disk for the nozzles. The force of gravity causes the 

 spray mixture to flow through a nozzle against the rapidly revolving 

 disk where it is thrown outward by centrifugal force. There is 

 scarcely any machinery to get out of order and clogging is almost 

 impossible, even with unstrained materials ; but much of the liquid is 

 wasted, the plants are not prefectly or evenly sprayed and, if the wind 

 is high and from the rear, the driver is liable to be thoroughly 

 drenched. 



Another kind of sprayer consists of the ordinary barrel and pump 

 mounted on a two-wheeled cart. The driver does the pumping, Sta- 

 tionary nozzles attached behind spray two or more rows. In other 

 cases the driver does the piuuping while one or two men follow be- 

 tween the rows directing a nozzle with each hand. In this case it is 

 convenient to have the lead of hose divided by a Y and have short 

 lines of hose leading from the Y to the nozzles. The one who is 

 spraying may carry the Y conveniently over his shoulder and hold a 

 hose in each hand. 



A better spray may be maintained with a horse-power outfit. Sev- 

 eral large potato growers are using home-made sprayers of this kind, 

 constructed from old potato diggers or from two- wheeled machines 

 suitable for the purpose. In some cases it is necessary to shorten the 

 axle to accommodate the wheels to the width of the rows. The first 

 of these outfits was made by Mr. J. S. Armstrong of Oakfield, N. Y. 

 His outfit (Fig. 38) consists of a barrel and pump mounted on a two- 

 wheeled truck with an attachment behind for spraying three rows, 



