OSCILLATING BLOWERS OF FLUIDS. 
243 
Mr. J. P. Stelle, of Citronelle, Ala., thus described, in bis report in 
1880, a simple device which be bad tested : 
•'It consists of a small, round tin box affixed upon the pipe of a common hand-bellows, 
the box sitting at right angles with the pipe. The top is perforated with numerous 
fine holes. London purple undiluted is to be placed inside the box and forced up 
through the perforations by working the bellows." 
Its poor feature is tbat wetness can enter tbe perforated face to af- 
fect tbe powder, and tbe outlets may clog, for tbe best time to apply dry 
poison thus is when tbe plants are wet. 
Several small hand-blowers are in the market, bat most of them are 
adapted only for killing bed-bugs and insects on bouse plants. 
Oscillating Blowers of Fluids. — Tbis application of tbe bel- 
lows promises to be of much importance. It affords tbe best obtainable 
blast for atomizing and blowing fluids* Tbe blast atomizers I bave de- 
vised and described below make mists of excellent quality and embody 
what seem to be tbe best methods of charging, directing, and discharg- 
ing the blast with liquid. 
Special attention should be given to the machines presented in Plate 
XXXI, Figs. 7 and 8, and in Plate XXXI 1, Figs. 4 and 5, described 
below. 
To prevent the bellows from sucking back (tbe liquid to be blown to 
atoms, or the air) from the blast-tube into itself, tbe blast leaving the 
bellows is passed outward through an excurrent valve. 
For feeding the blast with liquid to be blown to a spray the devices 
heretofore used in atomizers for surgical or other purposes are not well 
adapted to Acid-poisoning. The principle of blast suction so commonly 
employed in them will not lift from large, very deep reservoirs and feed 
to the blast the supply of liquid required in large machines j while those 
which use blast pressure are so constructed as to squirt the liquid of the 
reservoir upward in opposition to gravity, and to raise it thus out of a 
large, deep reservoir requires more exhaustion of force to operate the 
bellows than economy will warrant. And the same will be true when 
air-pumps are used as described farther on. A much better plan is thai 
in which the fluid gravitates into an automatic; feeder or directly iuto 
the blast passage, with or without the assistance of blast-pressure or 
blast suction. Thus it will be seeu that the blast-pipe to be fed with 
liquid should pass below the level of the liquid, and with this limita- 
tion may have any position that is convenient. If it pass outside the 
reservoir one or more conveyor-1 ubes to or from the blast must be added 
to communicate with the reservoir. To avoid some complication and se- 
cure greater compactness, with better working, the blast-tube is prefer- 
ably passed through or against the lower part of the reservoir, from 
which one or more passages gives the liquid exit into the blast-tube. 
The quantity to be fed out must be gauged by the size of the outlet or 
outlets, which may be formed of permanent size, or cau be increased, 
diminished, or closed at will by any adjustable partial or complete shut- 
