200 REPORT 4, UNITED STATES ENTOMOLOGICAL COMMISSION. 



sitely inclined, and formed by the end of the tube at s. A nozzle con- 

 structed on this plan can be made to throw nearer to the direction of 

 its axis. It should be observed here that in both the above nozzles at 

 least one of the slot-lips is beveled to make the inner edges of the lips 

 more approximate, and these same edges should preferably project 

 slightly inward to make clogging less liable. 



Allied to the foregoing is a third form of nozzle, as shown in Plate 

 XVII, Figs. 1 and 2. It differs from that in Plate XVI, Fig. 6, chiefly by 

 the cap possessing one or more slots, s, of its own, with lips beveled op- 

 positely, so that either can be set as a deflector, and shut or partially 

 close the corresponding tube-slot by being set back or forth. A nozzle of 

 this kind combines all the deflecting advantages of both the styles just 

 described. Probably the best way to construct this is to let the deflector 

 lips on the outside be formed by the margins of the cap c, on the one 

 side, and of a band, r, on the other, these parts being either independent 

 or narrowly joined at one or two or more places by a drop of solder, or 

 by a small narrow piece bridging across from one to the other. Such a 

 bridge may be turned to where it will divide the tube-slot into two, and 

 in this manner two or more separate sprays are produced from the same 

 nozzle. A similar nozzle is inversely constructed by having the inner 

 slot in a hollow plug, the outer lips formed by the rim of the ensheatbing 

 tube, and with a band fixed to, or independent of, the same, to combine 

 with either of the two sides of the plug- slot. 



I find that a very simple way of holding a deflector lip to a tube and 

 its outlet is to clamp it beneath a rubber band or rubber tube slid on 

 as a sheath. For example, a flat piece of sheet metal can be conformed 

 to the surface of the tube or nozzle, and then have one end bent up or 

 beveled as a deflector, while the other end may be shoved under the 

 rubber sheath, which will hold it in place. The plate can be pulled out, 

 or replaced, or adjusted, and when not needed over the discharge, it is 

 carried under the opposite end of the rubber. Of course metal sheaths 

 or partial bands can be used similarly, and a very good plan is to use 

 for a side clamp a spring ring soldered- or riveted fast at one point and 

 elsewhere free, but severed on the opposite side with inwardly beveled 

 ends to clamp the lip-slide. A similar ring attached to the lip serves 

 well for fixing it. 



The principle of rotation may be introduced with advantage in all the 

 preceding chambered forms of sh)t nozzles by making the supply en- 

 trance eccentrically parallel to a circumferential tangent to the rotation 

 chamber. I have made cheap sheet-metal nozzles, involving this prin- 

 ciple, after the plans indicated in Plate XVI, Figs. 1 and 3. In Fig. 3 the 

 spout, «, enters tangentially into the chamber, c, being soldered to it at 

 X. Xear the outside of this juncture is the cross-slot, s. The chamber 

 is formed of two concave pieces, or can be short, cylindritbrm, and may 

 have, for cleaning out, an opening closed by a can screw or otherwise. 



