TYPES OF NOZZLES 



101 



from the old form in being much larger, in having a larger orifice, and 

 in relying on the design of the chamber back of the orifice, combined 

 with an interposed plate, to give the finely divided spray desired. 

 It has large capacity, especially when operating under the heavy 

 pressure generated in a power outfit. The tendency to clog is reduced, 

 but unfortunately is not by any means entirely eliminated. At the 

 present stage in designing, it is the most satisfactory and efficient 

 nozzle for ordinary orchard work. Practically all of the manufacturers 

 of spray apparatus are making a nozzle of this type. 



For special work in spraying shade trees from the ground still another 

 type of nozzle has lately been evolved. This is essentially a heavy brass 



Fig. 65. — Types of nozzles. On the left, the vermorel ; in the center, the disk 

 type ; on the right the Bordeaux. Original. 



tube, from three to six feet in length, with gradually diminishing bore, 

 ending in a simple round orifice, from one eighth to three eighths of an 

 inch in diameter. It is operated under extremely heavy pressure, and 

 sends high into the air a solid stream which breaks into a fairly fine spray 

 as it nears the summit of its arc. Naturally the material is delivered at 

 a rapid rate. The advantage for extensive work on shade trees lies in 

 eliminating the necessity of climbing the trees, thereby reducing the 

 cost of spraying in spite of the amount of material used. 



Extension Rods 



Extension rods are necessary in orchard spraying, in order to elevate 

 the nozzles to a point where the spray can reach the upper parts of the 

 tree. Such rods are of two types : small iron pipe, and metal-lined bam- 

 boo. Iron rods are more commonly used, and are satisfactory, except 



