EXPLOSIVES 



i83 



then be inserted in the hole or other place prepared. If 

 one stick is not sufficient, other sticks can be placed around 

 the primer, or, if it is in a dry place, the paper wrappings 

 of the other sticks can be slit along one side and they can 

 then be packed into the hole and the primer placed along 

 the side or on top of the loose dynamite, the entire charge 

 being fired by one primer. The charge for electric firing is 

 prepared as described in Figure 162. 



Placing the charge. The location of the charge to 

 accomplish the desired results will depend upon the nature 

 of the material to be moved. It should be pressed down into 

 the hole with a wooden rod, care being taken not to break 

 the firing connection of the primer. The hole may be 

 tamped with clay, loam, or sand, and sometimes paper or 

 other visible material is placed 4 or 5 inches above the top 

 of the primer to locate the *- 



charge in case of misfire 



when it becomes neces- 

 sary to place a second 

 primer. This requires 

 time and is probably not 

 advisable unless there are 

 reasons for expecting a 

 misfire. Hard tamping 

 should not be resorted to 

 until the primer has been 

 covered 5 inches. The 

 more tightly and firmly 

 the charge can be put in 

 place, the more satisfac- 

 tory the results will be 

 and the less explosive will 

 be required. The fuse 



31 mrnmm 



Tight famp/hg 



Light famp/hf 

 Paperp/c/g 



^Dynamite 



Fig. 163. A charge ready for firing 



should be long enough to reach 6 inches above the tamping 

 and to give the operator ample opportunity to reach a place 

 of safety before the explosion occurs. (See Fig. 163.) 



