1902.] DISEASES AND INSECTS, ETC. I45 



Horse-power sprayers are coming more largely into use 

 among fruit growers now than formerly. One of the best 

 recent devices of the class is fitted with a very large air 

 chamber, and has a hand pump near the driver in addition 

 to the horse-power pump. In passing from one tree to 

 another enough pressure is obtained from the horse-power 

 pump to run the spray for several minutes. If a large tree is 

 to be sprayed, however, the pressure may go down before the 

 spraying is completed. A pressure gauge shows the driver 

 when the pressure is low, and he immediately operates the 

 accessory hand pump till the tree is sprayed. 



Steam spraying outfits are being used in the larger or- 

 chards, and also by the park departments of cities and towns, 

 with satisfactory results. Some of these are fitted simply 

 with steam pump, and depend upon horse power taken by 

 means of sprockets on the wagon wheel for running the 

 agitator. Others have an engine which runs both the pump 

 and the agitator, and mounted on the wagon which carries 

 the pump. Some use kerosene or gasolene for fuel; others 

 burn coal. 



One of the recent designs in spraying apparatus which is 

 worthy of notice provides for the use of compressed air for 

 spraying. Upon a two-wheeled cart is mounted one tank for 

 holding the compressed air, and another for the Bordeaux 

 mixture, the two being connected with one-fourth inch pipe. 

 A steam guage shows the amount of pressure. When a spray 

 is desired a valve is opened so that the compressed air forces 

 the Bordeaux mixture out in a fine spray. The amount of 

 pressure admitted to the liquid is regulated by the extent to 

 which the valve is opened. One horse takes the spray cart 

 even over rough hillside vineyards without upsetting, and the 

 spray continues uniform regardless of the position of the 

 liquid in the tank. No agitator is used, and if the spraying is 

 interrupted, and the mixture properly prepared, none seems to 

 be needed. The outfit consists of two carts like the one de- 

 scribed, and a gasolene engine and air pump for supplying 

 the compressed air. While one cart is being used the tanks 

 on the other are being filled, one with compressed air and 

 one with Bordeaux mixture, so that on the return of the first 

 cart the second is ready to be used. The engine and air pump 

 are mounted on a one-horse wagon so that they may readily 



Agr. — 10 



