New York Agricultural Experiment Station. 381 



never have trouble in this respect) the pressure at the finish will be 

 about one-half of what we started with. 



" Then when the cart returns to the loading station the connection 

 is closed and the pressure in the air tank is saved, while the pressure 

 in the mixture tank is used to blow it clean from sediment. Each 

 tank is provided with a pressure gauge and the full pressure of the 

 air tank is not let into the mixture, but only enough to raise it to 

 forty or sixty pounds as may be wanted. It is not necessary to keep 

 adjusting the connecting valve. The operator soon learns how -much 

 to open it to keep the pressure even in the mixture tank. If for any 

 reason the operation of spraying is stopped for a few minutes the 

 valve must be closed, to be reopened when work is commenced 

 again." 



To reach the tops of tall trees the Pierce-Loop Sprayer Co. has 

 devised a stand pipe shown in Fig. 46. It consists of a piece of one- 

 inch steam pipe of suitable length suspended free in a frame at the 

 point where the hand lever is attached, as shown in the illustration. 

 It is held upright by a box of stones attached to the bottom of the 

 stand pipe. At the top are two short horizontal arms, each with a 

 cluster of four nozzles at the end. Free rotation of the stand pipe 

 is obtained through the hand lever, and vertical control by a hand 

 rope. The stand pipe can be instantly pulled over so as to pass under 

 limbs not less than five feet above the ground. The support is 

 mounted on a sled which is attached by a chain and hook to the back 

 of the spray cart. 



W. H. Owen of Catawba Island, Ohio, has patented a pivotal 

 standard (Fig. 45), for use with the Pierce-Loop outfit. It also con- 

 sists of a piece of steam pipe pivoted to a base and held upright by 

 the operator when in use. Along its sides at regular intervals are 

 twelve nozzles, with which spray blasts are simultaneously given on 

 approaching and passing a tree, by turning a valve. 



Mr.W.E. Howard of Holley, N. Y., has a home-made outfit which 



