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INSECTICIDE APPLIANCES. 



MODIFICATIONS OF THE RILEY OB CYCLONE NOZZLE. 



By C. V. Riley. 



We have for some time been at work on a Bulletin on Insecticides 

 and Insecticide Appliances, in the preparation of which we have had 

 the assistance of Mr. W. B. Alwood, who, as we announced in the last 

 number, has accepted a position in the Virginia Agricultural Experi- 

 ment Station at Blacksburgh. There is no certainty as to when this 

 Bulletin will be published, and as we are informed that the condition 

 of the printing fund will probably not justify its publication during this 

 fiscal year we have decided to extract portions of it in advance for the 

 pages of Insect Life. The inquiries which come to us for information 

 upon the subject of the Cyclone or Eddy-chamber Nozzle, whether as 

 to the principles of its construction or as to where it can be obtained, 

 have induced us to take this up first, and in this article it will be our 

 endeavor to give a clear and simple exposition of its features that will 

 permit any good machinist to construct it. • 



It may not be amiss to emphasize the fact here that this invention is 

 public property, being an outgrowth of our work for the Government, 

 and that all patent claims involving the principle may be ignored by 

 the public. Since the publication of our Fourth Report of the United 

 States Entomological Commission some important modifications have 

 been perfected, especially abroad, and it is to these that we desire to 

 call more particular attention. While the terms " Cyclone " or " Eddy- 

 chamber " apply to the whole class of nozzles constructed on the same 

 principle, it has become necessary to designate some of the modifications 

 by specific names. Usually they have been given the name of the indi- 

 vidual who devised the modification, and, following this rule, the ordi- 

 nary and original form which we have adopted in this country should 

 be known as the " Riley Nozzle," by which term it is already exclu- 

 sively known abroad and which it is desirable to adopt for the sake of 

 clearness of statement. 



THE TYPICAL RILEY NOZZLE. 



As adopted for our work this form is illustrated at fig. 54, which 

 shows the general appearance and detail of structure, with also an 

 outline drawing of an angle-faced chamber. 



At A is shown the typical small-stemmed nozzle with the screw- 

 cap c above the chamber a as it appears when removed from the 

 chamber. The circular body of this cap is chambered out inside 

 and screws down to the bottom of the chamber a, the orifice d com- 

 ing in juxtaposition with the orifice e, shown in the section at B, in 



