INDUSTRIAL FUMIGATION AGAINST INSECTS 



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Figure 16. — Equipment for fumigation of flour mill from loading platform. Note 

 six cylinders of liquid hydrocyanic acid, two electric motors, outlets in the wall 

 leading to six piping systems to carry fumigant to six separate compartments, 

 floors, or pipe lines within. The two motors are forcing, by air pressure, the 

 liquid hydrocyanic acid in two of the cylinders through rubber hose into two of 

 the systems of copper piping within. Note placard on door warning of danger. 



Figure 17. — Installation of %-inch copper piping for introduction of liquid hydro- 

 cyanic acid. This piping, being flexible and easily cut with a saw, as indicated, 

 can be run along side walls and out along rafters, or to any point where it seems 

 best to install the spray nozzles. 



