INSECTICIDES AND REPELLENTS 



47 



A kit developed for use on L-19 aircraft consists of two Chemical 

 Warfare M-10 smoke tanks, modified with a venturi discharge system, 

 which can be attached under the wings by the standard bomb-shackle 

 mount. 



Exhaust generators. — The possibility of utilizing the exhaust of a 

 plane for atomizing and dispersing DDT was first investigated at 

 the Orlando laboratory in 1943. A dense smoke (fig. 18) was produced 

 when DDT solutions were injected into an extension of the plane's 

 exhaust pipe, and this method gave promising results against both 

 larvae and adults of mosquitoes. Later a venturi within the exhaust 

 pipe (tig. 19), which improved the performance, was developed by the 



ft '■■» % : % 



Figure 18. — A C-47 plane with exhaust fog generator in operation. 



Figure 19. — Exhaust generator venturi installed at end of exhaust pipe of a 



PT-17 plane. 



