INSECTICIDES AND REPELLENTS 



39 



or flying. On the. other hand, with a light breeze in a favorable 

 direction and with air movements toward the ground, which occur 

 when the temperature of the ground is lower than that of the air 

 (inversion conditions), fog drifting slowly through woods or dense 

 vegetation may be highly effective. 



:H-P 





*•:•:■ -;i:, «:;#;, ; m ; v; -r ■■■- : s a ■ v .. ■ M^m^^^^ ; -««. " :, f '■'.-■-■■■'.:-. :: V : :: 



■..'■:■';■■■ ■ ■:■■'■.■■■■. 



^^■:.,:-^-'.-.'-^. ■■?->:■■.;■ ■ . >,■%-■ •■":'■■'■■-■%- ■'■■■■' ■ . '■-,: Vv^v^f . '. . .,.:.-. ..,■'■■ . .. -,\ , 



Kit '«lljr "*" 



Figure 12. — Jet-type fog machine in operation. 



.. . . : , .. .... ; . .. .... 



Figure 13. — Motor-exhaust fog generator in operation. 

 350828° — 55 6 



