216 



than for continuous solid jets with the spray produced externally. Clog- 

 ging is also further relieved by the ingoing jet being forced strongly 

 across the inner face of the outlet, tending to carry past it any obstruct- 

 ing matters, to keep them in motion in the eddy within, as already no- 

 ticed with the slot-nozzles having interval rotation. And, here again, as 

 there, a projectile or a bod^- whirling on its axis may be used inside, 

 operated by the current to wipe away or disintegrate bodies, which 

 would lodge upon the outlet. 



I^Tozzles made on these principles can be applied as nose-pieces to 

 screw onto the ends of blast-pipes, and discharge at an angle, or they 

 may be formed to throw the spray directly ahead in the direction of the 

 pipe. In Plate XXVI, Fig. 4, is presented a plan-section of this pat- 

 tern in a shape it may possess either as a nose-piece or as an entire noz- 

 zle. The spout, a, is purposely made very short. It is attached tangeu- 

 tially to the shell of the chamber, c, from which, s, is the discharge. In 

 the chamber a partial sey)tum or w^all terminating at x to Ueep the fluid 

 from entering the rotation-chamber, until it is conducted around to where 

 it will sweep across the inner face of the outlet, s. This septum may be 

 immediately inside the outer shell or inside of an inner shell, forming a 

 hollow shut-oft" plug as shown. 



These whistle-jets work well on blast-atomizers, and also produce a 

 fair spray of liquid, but for the latter purpose it is yet uncertain if they 

 can be made to produce a spray equal in fineness to what is thrown hy 

 the true eddy -jets with central discharge. 



Eddy- JETS pboper, as a general rule, have the chamber of a circular 

 form, and the jet-hole ought to be at the center of rotation, which may 

 vary in some instances from the center of the nozzle. The supply- stream, 

 a?, in the figures already seen, naturally crowds the eddying mass and 

 its center of rotation somewhat toward the side opposite the inlet. A 

 swell can be made on one side of the chamber, as shown in Plate XXIY, 

 Fig. 3, at ^, to throw the entrance of the supply-stream outside of a tan- 

 gent to the true circle of rotation, which is bounded by the bodj^ of the 

 chamber, but the advantages from this are not so great as to prevent 

 the simpler circular form from being most generally used. 



A similar feature appears In the nozzle shown as seen from above and 

 in profile in Plate XXY, Fig. 7. The chamber has a spiral, conoid con- 

 tour, resembling the form of a cone-shell, but with a central apical dis- 

 charge. The dotted line shows the inwinding course of the basal margin 

 of its side, which leaves a trifacial inlet-passage on the side, x. The 

 spout, a, has one end of trifacial shape, and of a size to fit the chamber, 

 which is partly inserted in its end, and joined to it in the line, x — s. The 

 spray j^roduced is of good quality, but is thrown narrower and farther 

 than, yet not so fine a^, from the flat faced chambers. Nevertheless, 

 where the squirting power is onlj the gravitation from an elevated 

 reservoir, or is otherwise limited, cases can occur where the given pres- 

 sure does not give or throw fine spray high enough, and nozzles of this 



