PNEUMATIC COMPRESSION SQEIRTERS. 
Several years ago while teaching chemistry I made a gas generator 
on this plan, and it gave perfect satisfaction. Where other gases are 
used, such as are generated by heat, such a metal generator is very 
essential. The generator chamber needs to be cleared out or charged 
Occasionally, and this is not easily accomplished, unless its end opens 
entirely by a removable plug or cap. The metal chamber can be 
roughly jarred or gouged out with no resultant breakage. The acid 
chamber ought preferably to have its neck or mouth provided with a. 
metallic lead cock or other secure non-corrosible shut oft' device. 
ROTARY FORCE-BLAST, COMPRESSION EJECTORS. 
The rotary force blast blowers have not yet been utilized in insecti- 
cide machines. 
OSCILLATING BELLOWS, PNEUMATIC COMPRESSION EJECTORS. 
[Plat.- XXXV.] 
The bellows recommended for blowing powder and atomizing liquids 
can also be used for producing air-pressure in a tight reservoir to eject 
the liquid contained ; and in tins way may serve as a substitute for a 
force-pump or gas generator. The bellows should be small and very 
strong, that an unusual amount of power may be applied to do this 
work. In order to avoid resuction of the blast back into the bellows 
and to be able to produce a constant condensation in the reservoir an 
excurrent valve from the bellows must be Interposed between it and the 
reservoir. By such means parties having a bellows for atomizing can 
also apply it as a machine to squirt liquid for poisoning or irrigating, 
&c, and its notice here may in some cases prevent the purchase of a 
force pump when not necessary. Also experiment with such devices 
may show that they are preferable to pumps in some squirting machines. 
Since many prefer the application of dry powder in rainy weather, and 
of wet poison in dry weather, such parties can make a bellows answer 
for both methods. The bellows may be worked beneath the foot, and 
the weight of the operator's body can thus be used, which will be found 
more pleasant than the exertion of arm-power. Machines for squirting 
by bellows-pressure are now articles of trade, and in use chiefly for 
forcing beer, &c, from barrels. So far this use of the ordinary bellows 
only promises to be practical where small pressure will answer. 
The simple process is indicated in Plate XXXV, Fig. 5. The bellows, 
v, operated by the lever, by foot, by hand, or machinery, discharges 
through its excurrent valve and the pipe, 1c, into the top of the barrel, r, 
whereby the air compressed in r forces the liquid, p, downward, causing 
its ejection through the outlet tubes, n or m-m. Nozzles, ss, may be 
connected to the outlet tubes in any suitable number or by any system 
of couplings or pipes. There are other ways of combining the bellows 
with the reservoir, but only one simple illustration can be given here. 
63 cong 17 
