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MISC. PUBLICATION 3 5, U. S. DEPT. OF AGRICULTURE 



dust guns cost from $12 to $20 each, and one gun can not be used 

 to dust more than 8 acres of cotton in any one season. It is very 

 hard work to operate one of these little machines all day long. 



The 1-mule machine (fig. 7) is pulled by a mule or horse that walks 

 between two rows of cotton. There are two nozzles sticking out 

 behind this machine, as you can see in the picture, and the poison 

 dust is blown through them onto two or three rows of cotton as the 

 machine moves through the field. This machine costs from $75 to 

 $125, and one machine can be used to dust as much as 60 acres of 

 cotton each season. It will dust 15 to 20 acres in a single night. 



The cart machine (fig. 8) has two wheels that straddle a row of 

 cotton and is drawn by two mules or horses. It has three nozzles 

 and will poison from 25 to 30 acres of cotton in a single night. One 



Fig. <. — Ihe 1-mule dusting, machine is pulled by a mule or horse that walks be- 

 tween two rows of cotton. The poison dust is blown through two nozzles onto two 

 or three rows of cotton as the machine moves through the field 



such machine can not be used to poison more than 100 acres of cotton 

 through the season. 



Within the last few years the airplane, too, has come to be used 

 as a dusting machine. (Fig. 9.) Of course this does not mean 

 that any airplane can be used for this work. You have probably 

 seen airplanes 'way up in the air and perhaps wished that you were 

 riding in one. The low flying that is clone while dusting cotton is 

 more dangerous than that done high up in the air. The plane has 

 to be flown close to the ground, sometimes almost touching the cotton 

 plants, and it can not be flown as fast as those high up in the air. 

 Fortunately for those doing this kind of work there are specially 

 built planes which can stay in the air while going much slower than 

 can ordinary planes. 



