CENTRIFUGAL NOZZLES 219 



top of the plug, since the latter has more crooks iu its supply passage 

 and hence requires more force to produce the same effect. 



The following throw both kinds of jets, but have no right-angle dis- 

 charge. The adjustable parts of one, involving an eddy -jet, are shown 

 in Plate XXVI, Fig. 2. The eddy-chamber, c, is without an immediate 

 spout, but has an inwinding, peripheral wall, leaving the inlet, x, and a 

 much depressed side from x to c. Its discharge is at s, and on its oppo- 

 site axis may be fixed a packing and shut off plate, j. There are several 

 variations in the construction of this whole arrangement, but, as shown 

 here, the eddy-chamber is really a spiral septum, and its side toward s 

 has no wall but that of tlie outer cap, c, against which it is held by the 

 water-pressure upon its base, j. Thus it is inclosed in another chamber 

 formed by the cap, c, having a corresponding discharge, and beng screwed 

 upon the hoUow plug, e, which has a central inlet, a. The inner rim of 

 this plug is shown to have projections which hook upon corresponding 

 processes of the basal margin of the eddy-chamber, c. The oi)posite 

 passages, a and s, match each other, as do the two opposite screw-sock- 

 ets, ww'. These parts being the same, they are reversible, so that 

 either end may be used in turn as inlet or discharge. When tv is used 

 as a hose-socket s is the spray-outlet, or a solid-jet pipe may be screwed 

 into the socket, w'. And, inversely, iv' may serve for a socket, while 

 the jet is thrown from the opposite end. In this case the internal 

 rim-projections should interlock inversely. 



The operation of this device may be explained as follows : Supposing 

 the water is injected at a, it i)asses across through theinlet, x^ to eddy in the 

 chamber, c, and discharges as a spray, at s. Screwing the cap, &, farther 

 on the part, e, the eddy-chamber and its base piece, j, are pressed toward 

 or against the inlet, a, as a shut-off, to close it and stop the jet entirely 

 or lessen its volume to any degree desired. On the other hand, screw- 

 ing off the cap, c', until the face, 6-, is carried away from the hanging cham- 

 ber, c, the water takes the less circuitous course, j c s, across the out- 

 side of the eddy-chamber, and, witbout whirling, issues as a solid jet. 

 By another arrangement in the same nozzle the solid jet is passed 

 straight through the center of the base of the eddy-septum at j; but 

 many details cannot be described here. The inlet passage being simple 

 and of good size, there is little susceptibility to choking in the nozzles 

 described above, and the parts are separable, so as to be easily accessible 

 for cleaning out. A cheaper construction for this nozzle can be had by 

 using can-screw caps and the other parts all of sheet-metal. All the 

 effects are about the sanie except the shut-off' adjustment, which for 

 force-pump nozzles is usually not needed. 



There are also other modifications and combinations of the eddy- 

 chamber, but I have noticed enough for the purposes of this report. 



FiSTULAR. — Several Fistular Spray-jwzzles^ known as hose-pipes or 

 barrel nozzles, that may alternately produce both kinds of jet from the 

 same barrel, have been patented, but the fact is that the attempts to 



