218 REPORT 4, UNITED STATES ENTOMOLOGICAL COMMISSION. 



Wheu the spout is similarly attached od the base, as in Plate XXIV, 

 Fig. 5, the spray is directed off froai the person holding it, which may 

 be preferable for broadcast spraying. 



The nozzles so far described can be used independently or as nose- 

 pieces on solid-jet hose-pipes or other spouts. In Plate XXV, Fig. 5, a 

 represents a common solid-jet hose-pipe with an eddy-chamber screwed on 

 as detacbable nose-piece. In such cases it is well to have a nib on the side 

 of the pipe, onto which to screw and carry the end piece when the solid 

 jet is in use. The nose piece with side discharge will generally be pre- 

 ferred, since it can be also used for underspraying or as a fountain jet, 

 as well as for broadcast work. For these reasons, also on account of its 

 simplicity and freedom from choking, and because it makes with any 

 given pressure a finer spray, it can be recommended as superior to all 

 the other spray-combinations in solid -jet nozzles. In case such an eddy- 

 chamber nose-piece with direct discharge be desired for any purpose it 

 is supplied in what I call the double-cone nozzle or double-chamber nozzle 

 shown in Plate XXXIX, Fig. 2, /. Its internal construction is similar 

 to what is shown in Plate XXVI, Fig. 2, and described below, but with- 

 out the adjustability which is not needed in a nose-piece since the hose- 

 pil^e has a shut-off plug. Another point worth attention is that these 

 nose-pieces can be used without a solid-jet nozzle by inserting the short 

 inlet- tube in the end of a piece of hose and applying a simple wire wrap. 



Examples of other methods of combining rotary spray chambers with 

 the solid jet hose-pipes should be noticed. In Plate XXVI, Fig. 3, is a 

 longitudinal section of a solid -jet pipe, aj^ with a shut-off plug, h. The 

 passage n through the plug stands now at right angles to the pipe and 

 shuts off the solid jet, but it may be seen that the wall of the plug is cut 

 away at % opposite one end of the hole, n^ to form an excentric inlet, i, from 

 a to n and to the interior of the plug, which is a hollow tubular shell, 

 from end to end. The lower end of the plug is closed and held by the 

 screw-plug e, but the upper end has the eccentric tangential passage x 

 into the eddy -jet chamber, forming its head or thumb-piece and serving 

 as a spraying device. This chamber has the construction already de- 

 scribed, with its spray, s, oi)erating in the direction of the solid jet when 

 the latter is closed. The water from the spout, «, enters tangentially 

 through the passage, i, and rotating inside of the hollow plug, ft, ascends 

 through the tangential inlet, x, to rotate in the chamber, c, and discharges 

 as a spray from the outlet, s. When a spray is not wanted the hollow 

 l)lug of the eddy-chamber is turned a little, so that the inlet, ^, does not 

 coincide with its mate, the shell-inlet. Another shift sometimes of ad- 

 vantage is made thus: The solid plug, 6, and the hollow plug,/, being of 

 the same size, are interchangeable, so that the latter maybe used to throw 

 from the base of the plug and at right-angles to the pipe a spray for 

 spraying the under surfaces of plants, or such that it can be set upward 

 anywhere as a fountain. This gives a better spray than that from the 



