160 PEACH LEAF CURL: ITS NATURE AND TREATMENT. 



are closed. Along both sides of this main pipe and its lateral 

 branches are drilled small holes for the escape of steam into the tank. 

 The flow of steam to the tank is controlled by means of a globe valve 

 in the steam supply pipe, the valve being conveniently placed for the 

 workman at the tank. Broad board covers are made for covering the 

 whole tank when the boiling is in progress. As in the case of the 

 spraj^-boiling plant of Mr. Cutts, the main steam pipe leads from the 

 tank directly to the steam dome of the boiler. The spray is prepared 

 in the boiling tank of double strength, and when sufficiently boiled is 

 elevated to the storage tank above by means of an appliance planned 

 like an injector of a boiler. An iron pipe about 2 inches in diameter 

 leads from the boiling tank upward and over the top of the storage 

 tank described. In this pipe is placed the injector, which is supplied 

 with two lateral connections. One of these connections is with the 

 cold-water supply pipe, and the other is with the main steam supply 

 pipe. In each of the pipes connected with the injector are placed 

 globe valves for the control of the inflow of water, steam, and hot 

 spray. When it is desired to fill the storage tank above with hot 

 spray from the boiling tank below, the valve opening into the 

 steam pipe leading from the injector to the steam dome is opened. 

 The live steam at once escapes through the injector into the pipe 

 leading to the storage tank and then out of the end of the pipe. 

 The valves leading to the boiling tank and the cold-water supply are 

 now opened in such a manner that about equal parts of cold water and 

 hot spray are admitted to the injector, and the escaping steam, by 

 means of its tendency to form a vacuum, soon causes a combined 

 stream of hot spray and cold water to follow up the pipe and escape 

 into the storage tank above. There is thus established a kind of steam 

 siphon, which soon carries up 150 gallons of boiled spray and an 

 equal amount of cold water, filling the 300-gallon storage tank with 

 spray of the required strength, the strength of the spray in the boil- 

 ing tank being double that required. This work is accomplished by a 

 careful adjustment of the inflow of steam, spray, and water to the 

 injector, the storage tank being filled without the necessity of lifting 

 a pound of spray by hand. The combining of the cold water with the 

 hot spray in the injector is found to be necessary to the proper working 

 of the latter as the temperature of the injector would otherwise become 

 too high for efficient work. When the storage tank is full, steam is 

 turned into the pipes situated at its bottom, and the spray is again 

 heated to the boiling point and kept very hot until drawn off into .a 

 spray tank and taken to the orchard. The facility with which a plant 

 of this description may be operated will depend to quite an extent upon 

 the nature and capacitj^ of the holier used for generating steam. The 

 more easily steam can be generated and the greater capacity for steam 

 which the boiler possesses the better for the work. 



