THE MONTHLY BULLETIN. 



71 



the main cylinder. The supply tanks are constructed of iron and the 

 upper part of the main cylinder is also of iron. To lessen corrosion, the 

 lower third of the main cylinder is constructed of lead of about one-half 

 inch thickness, as shown in Fig. 16. The measuring of the acid and 

 cyanide is managed Iw means of levers which does away with the incon- 



FiG. 16. — The Owl fumigating machine, as 

 constructed during the season of 1914- 

 1915. showing the leaden construction of 

 the lower third of the main generating 

 cylinder. (Original.) 



venience of weighing and measuring by hand. The carrying of pots is 

 also avoided. Provision is also made for the collection of the residue 

 which is carried off from the field at intervals. 



ANOTHER MAKE OF FUMIGATING MACHINE. 



Operating under the same patents, the J. A. Buttress Machine Works. 

 Los Angeles, have constructed a fumigating machine which has been 

 operated by the San Diego Land Corporation at Chula Vista. Accord- 

 ing to the statement of the manufacturer, the machine was in the nature 

 of an experiment and the intention is not to build another of the samd 

 design. It was made up. however, on the same principle as the Owl 

 fumigator. though different in some of the details. Mr. J. A. Prizer, 

 who has been directly in charge of its operation, makes the statement 

 that he is very much pleased with its performance, even though con- 

 siderable difficulty was experienced due to corrosion of valves. The 

 most essential feature of difference between the construction of the two 



