OSCILLATING BLOWERS OF FLUIDS. 247 



is shown in Fig. 7, where p is the feeder-can containing the liquid 

 poison and y is the blast-pii)e. This is united with a screw cap or plug 

 which unscrews to separate aud open the can. From the blast-pipe 

 there projects a small tube, x-y, in the can and oi)euing near the basal 

 apex, X. This is the feediui^-tube to conduct the liquid up into the blast. 

 Its lower end, x, is at the bottom of the liquid aud will remain so whether 

 the side, «, or the side, n, be down, wherefore the blast-pipe may be di- 

 rected considerably downward or upward or horizontally without bring- 

 ing this end above the liquid. The opening of this end is iDreferably 

 quite small, but even for single sprays of good size it need not be small 

 enough to clog, with ordinary care to keep the liquid free from rubbish. 

 But when in careless hands, or dirty liquid must be engaged, clogging 

 may occur. In such cases the can is removed, and a wire forced up 

 through the small passage to clear it. When no can-screw is employed, 

 and the pipes are inseparably joined to the can, a means for clearing the 

 feed-pipe is provided by having its lower end extend through the base 

 of the can where it is plugged, while a lateral perforation through it just 

 inside of the Civu admits the liquid. Then the end may be opened to pass 

 up the wire probe. Also, the feed-hole into the side of the tube may 

 be formed as a slot, which can be more or less closed by adjusting the 

 plug sliglitly, and thus the liquid sux^ply can be increased or dimin- 

 ished or shut off. The plug may shut off the inlet either by deeper in- 

 sertion or by rotation upon the axis. The upper end of the feed-pipe is 

 generally cut diagonally, and this diajronal part projects into the blast 

 with its slope to the leeward. There are certain delicate advantageous 

 X:)eculiinities of form for this orifice which need not be detailed here. 

 Kear the feed-pipe perforations are made to allow blast-pressure to be 

 exerted upon the liquid to force it up in the feeder-tube. Thus the feed- 

 ing principles are similar to those iu the device just jjreviously described. 

 Also the uses of the automatic supply-tube, I, are the sameas were given 

 above. But in the machine before us there is not an immediate spraj'- 

 discharge ; the blast and the liquid fed to it are conducted onw^ard by 

 an extension-pipe. If this be very short, as at j-s, in Fig. 8, and the 

 mouth -piece, o, be blown-iuto strongly, a direct spray will be emitted at 

 s; but the longer this extension-pij)e and the more roughness and crooks 

 it possesses the more will the spray become condensed against the side 

 of the pipe, or separated from the blast to flow in the pipej wherefore 

 at some distance its valuable qualities are lost. But by these means the 

 liquid and the blast are both conducted in one and the same pipe, to be 

 reatomized by the terminal nozzle or nozzles. Instead of the oral blow- 

 pipe of Fig. 8 a bellows may be attached on the one end and a long ex- 

 tension-pipe on the other. This arrangement appears in Fig. 6, where 

 like letters indicate how the parts correspond to those of the figures 

 already just described. 



The pipe terminates in the simplest form of reverberatory nozzles, de- 

 scribed above. Certain of these give spray at an angle from the pipe. 



