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 eft'ect. 
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, Tig. 2. The eddy-chamber, c, is without an immediate 
spout, but has an inwinding, peripheral wall, leaving the inlet, j*, 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 oft* plate,/ 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 8 
has no wall but that of the 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 hollow 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 opposite 
passages, a and \, match each other, as do the two opposite screw-sock- 
ets, trie'. These parts being the same, they are reversible,, so that 
cither end may be used iu turn as inlet or discharge. When iv is used 
as a hose-socket I is the spray-outlet, or a solid-jet pipe may be screwed 
into the socket, w'. And, inversely, w' 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 passes across through the inlet, .r, to eddy in the 
chamber, c, and discharges as a spray, at s. Screwing the cap, v' , farther 
on the part, r, the eddy chamber and its base piece,./, are pressed toward 
or against the inlet, «, 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 oil" the cap, c', until the face, 9, is carried away from the hanging cham- 
ber, c, the water takes the less circuitous course, j c s y across the out- 
side of the eddy-chamber, and, without whirling, issues as a solid jet. 
By another arrangement in the same nozzle the solid jet is pa # ssed 
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 same except the shut-otf 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 Fistula)' Spray-nozzles, 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 
