MONTHLY BULLETIN. 



277 



the orchard, these pipes branching from a main lead in the center of 

 the orchard, extending througliout its length in a northerly and 

 southerly direction from point B in main lead from warehouse. Serv- 

 ice cocks were to have been placed every 10 rows apart. This plan 

 required the use of 125-foot leads of hose which were found to be too 

 long for one man to handle. In order that this difficulty might be 

 overcome the pipes Avere laid 8 rows or 8 rods apart with hose connec- 

 tions every 5 rows, so that 40 trees are now sprayed from each lead 

 which is only 75 feet and which can be readily handled by one man. 

 The depth of pipes is about 18 inches. 



Fig. 94. — Spraying cherry trees one-half mile from the pumping station. (Orig- 

 inal.) 



COST OF INSTALLATION. 



Mr. Gammon states that the cost of his system, exclusive of the motor, 

 was about $5,000. This cost may seem prohibitive to some, but when 

 the permanence of the system, the saving in cost of spraying, the saving 

 in time and material, and general efficiency are considered, it is prob- 

 able that any paying orchard of 50 acres or more will justify the 

 installation. 



Mr. Gammon has pointed out only one difficulty that he has encoun- 

 tered since beginning operations with his plant last spring, and that is 

 leakage in the valves which are rapidly damaged by the grinding of a 

 sulphur spray forced through the pipes under high pressure. The 

 atomic sulphur was used extensively by Mr. Gammon in spraying for 

 the control of scab, and its use resulted in the damage as described. 

 No doubt arsenate of lead or any other granular spray held in sus- 

 pension would have the same tendency, which will undoubtedly be 

 remedied in time by specially constructed valves. 



2—24940 



