234 REPORT 4, UNITED STATES ENTOMOLOGICAL COMMISSION. 
to be indicated. The novelty appears to consists chiefly in the ad- 
justable arrangement of the blower, and in its means of combination 
with the barrel, agitator, and carriage wheels. 
" Mr. Charles T. Hurd, of Victoria, Tex., whose machine for dusting 
has been described and figured on Plate XXIX, Figs. 1, 2, and 3, sug- 
gests in his claim that by changing the oscillating screen b and insert- 
ing a perforated bottom in the box A, and charging the same with 
poisonous liquid, the latter may be atomized by the current of air orig- 
inated by the blower, and thus applied to the row of plants over which 
the apparatus is drawn." 
This is virtually the combination of a rotary blower with a many- punct- 
ured sprinkler, and the recognized faults of the latter have been already 
given in discussing the disadvantages of many-punctured nozzles from 
their clogging, &c. The blasts from rotary blowers are not intense 
enough to be valuable for atomizing. From the construction shown in 
this machine it is evident that the spray from the perforated screen 
would be carried by the blast, but not that the blast would atomize it 
finely; also, the downward course of the spray is not suited for reach- 
ing the under surfaces of the foliage. 
" Finally, in this connection, it is well to state that Mr. Hurd sug- 
gests that with some slight change his machine can be converted into 
a vaporizer, so as to throw a jet of poisonous vapor on the plants. 
"Another rotary-blast vaporizer " was invented by Dr. M. Perl, of 
Houston, Tex. (Patent Xo. 91,365, June 15, 1869), for the purpose of de- 
stroying the worms by means of sulphur vapor, and consists, in the 
main, of a gas-generator, which is placed on a cart, intended to be drawn 
between two rows of cotton, and provided with a fire-box and a blower 
worked by means of a pulley. 
" The accompanying diagrams, Plate XXIX, Fig. 4, represent this ma- 
chine, the upper figure being a vertical section and the lower a side 
elevation. 
"Upon the wagon A is placed the gas generator B, consisting of a fire-box, c, sepa- 
rated from lower part of the generator by a concavo-convex bottom &. 
"To the upper chamber D of the generator is attached one end of the blower or bel- 
lows E. This bellows is provided with a bhaft, d, upon which are secured metal 
wings, d' . 
" On one end of the shaft d is attached the cog-wheel e, gearing into the cog-wheel 
e', secured to the wagon -wheel G. The other end of the shaft is provided with a crank, 
/', which is attached to upper end of pitman i, the lower end of this pitman being at- 
tached to the pedal h, secured to pendants /*' h', attached to the under side of the axle- 
tree H. G" is a hose, with a perforated nozzle, m, and stop-cock, It, which is attached 
to the top of the gas-generator. M is tin 1 chimney. 
''The machine can be operated, when in motion or stationary, in the following man- 
ner : 
"A fire is made in the fire-box c, and a certain quantity of sulphur is placed in the 
gas-generator B, in order to form sulphureous gas. Tho blower E is set in operation, 
when in motion, by the cog-wheels e e', and, when stationary, by detaching the cog- 
wheel tf and attaching it to the crank /. 
"The action of the blower or bellows will not only furnish sufficient air in forming 
■ulphureous gas, but it will also force the gas through the hose to any desired point. 
