BACK-FIRING. 



87 



rain or change of wind, or by meeting some barrier 

 which they can not pass. A barrier of this kind is often 

 made by starting another fire some distance ahead 

 of the principal one. 

 This back-fire, as it is 

 called, must be al- 

 lowed to burn only 

 against the wind and 

 toward the main fire, 

 so that when the two 

 fires meet both must 

 go out for lack of fuel. 

 To prevent it from 

 moving with the wind, 



a back-fire Should al- Fl - 82 - Settin g a back-fire on the windward 



side of a road. Southern New Jersey. 

 Ways be Started On the Drawn from a photograph. 



windward side of a 



road or a raked or sanded strip, or some other line which 

 it can be kept from crossing. (See fig. 82.) If it is al- 

 lowed to escape it may become as dangerous as the main 



FIG. 83. A fire line along a railroad with two cleared spaces separated by a 

 douhle row of trees intended to catch the sparks. 



fire itself. Back-fires are sometimes driven beyond con- 

 trol by a change of wind, but the chief danger from their 

 use is caused by persons who, in excitement or fright, 



