RECENT WORK WITH HYDROCYANIC ACID GAS 2IJ 



Station. This fumigator is about n^ feet high and 

 S)4 feet in diameter. As shown in Fig. 82, it is six- 

 sided and is intended to fold up when not in use. 



FIG. 8O THE SIRRINE TYPE OF FOLDING FUMIGATOR 



Kach of the six sides is rectangular and rigid. They 

 are fastened together by hinges. When in use the 

 whole fumigator is made rigid by a series of cross- 

 braces. The top is held in place by a series of hooks. 



