Table of Charges for Boulder Blasting 



Weight of Boulder 



Approximate Number of ij"x8" Cartridges 

 Required for: 



If boulders are largely buried in the ground they may be broken by 

 doubling or trebling the above charges, but it is generally less expensive 

 under these conditions to lift the boulder out of the ground by snake- 

 holing and then if it is too large to handle, to break it in pieces by mud- 

 capping. For lifting without breaking, the charges in above table may 

 be approximately reduced one-half. 



Ditching 



When properly used dynamite will excavate ditches entirely, spread- 

 ing the earth over the land some distance away. In the same way much 

 valuable land can be saved by blasting straight channels to straighten 

 and shorten the course of creeks and streams. It is not necessary in this 

 work to blast a large ditch or channel, for if the current is once started 

 through a small one it will soon wash it out to the proper size. 



Ditches can be dug economically and satisfactorily either through 

 dry ground, or in wet heavy soil, even though it should be covered with 

 several inches of water. The best and most systematic way of doing this 

 class of work is to : 



( 1 ) Stake out and measure the entire length of the ditch required. 



Multiply the total length in feet by 12 inches and divide by 28 

 in order to ascertain the number of holes to be punched or bored. The 

 divisor 28 is given to represent the normal distance between holes. In 

 stiff clay or hardpan holes should be 26 to 28 inches apart. In loose or 

 mucky soil where there will be a good flow of water to clean out bottom, 

 holes may be 30 inches apart. 



(3) Carry the necessary number of Red Cross Extra 20% car- 

 tridges required (one or two per hole according to conditions), as also 

 the number of Victor No. 6 Electric Fuzes with wires the required length 

 according to the depth and spacing of the holes (one fuze to each hole), 

 to where the work is to be done. 



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