2*34 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 h 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 low 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, bub not that the blast would atomize it 

 finely j 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 x^rovided 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 tlie wagou 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 c'. 



"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 shaft, 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 

 «', 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 li, secured to pendants li' li', attached to the under side of the axle- 

 tree H. G" is a hose, with a perforated nozzle, m, and stop-cock, «, which is attached 

 to the top of the gas-generator. M is the 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. The blower E is set in operation, 

 when in motion, by the cog-wheels e e', and, when stationary, by detaching the cog- 

 wheel e' and attaching it to the crank/. 



" The action of the blower or bellows will not only furnish sufiicient air in forming 

 sulphureous gas, but it will also force the gas through the hose to any desired point. 



