1) To determine the burn rate of a particular type of fuse, simply measure a 6 inch or longer piece of fuse and ignite it. With a stopwatch, press the start button the at the instant when the fuse lights, and stop the watch when the fuse reaches its end. Divide the time of burn by the length of fuse, and you have the burn rate of the fuse, in seconds per inch.
This will be shown below:
Suppose an eight inch piece of fuse is burned, and its complete time of combustion is 20 seconds.
20 seconds
~~~~~~~~~~ = 2.5 seconds per inch.
8 inches
If a delay of 10 seconds was desired with this fuse, divide the desired time by the number of seconds per inch:
10 seconds
~~~~~~~~~~~~~~~~~~~ = 4 inches
2.5 seconds / inch
NOTE: THE LENGTH OF FUSE HERE MEANS LENGTH OF FUSE TO THE POWDER. SOME FUSE, AT LEAST AN INCH, SHOULD BE INSIDE THE DEVICE. ALWAYS ADD THIS EXTRA INCH, AND PUT THIS EXTRA INCH AN INCH INTO THE DEVICE!!!
2) After deciding how long a delay is desired before the explosive device is to go off, add about 1/2 an inch to the premeasured amount of fuse, and cut it off.
3) Carefully remove the cardboard matches from the paper match case. Do not pull off individual matches; keep all the matches attached to the cardboard base. Take one of the cardboard match sections, and leave the other one to make a second igniter.
4) Wrap the matches around the end of the fuse, with the heads of the matches touching the very end of the fuse. Tape them there securely, making sure not to put tape over the match heads. Make sure they are very secure by pulling on them at the base of the assembly. They should not be able to move.
5) Wrap the cover of the matches around the matches attached to the fuse, making sure that the striker paper is below the match heads and the striker faces the match heads. Tape the paper so that is fairly tight around the matches. Do not tape the cover of the striker to the fuse or to the matches. Leave enough of the match book to pull on for ignition.
_____________________
\ /
\ / ------ match book cover
\ /
| M|f|M ---|------- match head
| A|u|A |
| T|s|T |
| C|e|C |
|tapeH|.|Htape|
| |f| |
|#####|u|#####|-------- striking paper
|#####|s|#####|
\ |e| /
\ |.| /
\ |f| /
\ |u| /
|ta|s|pe|
|ta|e|pe|
|.|
|f|
|u|
|s|
|e|
|.|
|_|
The match book is wrapped around the matches, and is taped to itself. The matches are taped to the fuse. The striker will rub against the matcheads when the match book is pulled.
6) When ready to use, simply pull on the match paper. It should pull the striking paper across the match heads with enough friction to light them. In turn, the burning matcheads will light the fuse, since it adjacent to the burning match heads.
4.22 IMPACT IGNITION
Impact ignition is an excellent method of ignition for spontaneous terrorist activities. The problem with an impactdetonating device is that it must be kept in a very safe container so that it will not explode while being transported to the place where it is to be used. This can be done by having a removable impact initiator.
The best and most reliable impact initiator is one that uses factory made initiators or primers. A no. 11 cap for black powder firearms is one such primer. They usually come in boxes of 100, and cost about $2.50. To use such a cap, however, one needs a nipple that it will fit on. Black powder nipples are also available in gun stores. All that a person has to do is ask for a package of nipples and the caps that fit them. Nipples have a hole that goes all the way through them, and they have a threaded end, and an end to put the cap on. A cutaway of a nipple is shown below:
________________
| |
_ |
| | |
_______| |^^^^^^^^| |
| ___________| |
| | | no. 11 |_______| | percussion _______ | ---- threads for screwing | | | nipple onto cap here |___________ bomb | | |
|______ | |
| | ^^^^^^^ |
|_| |
|
|________________|
When making using this type of initiator, a hole must be drilled into whatever container is used to make the bomb out of. The nipple is then screwed into the hole so that it fits tightly. Then, the cap can be carried and placed on the bomb when it is to be thrown. The cap should be bent a small amount before it is placed on the nipple, to make sure that it stays in place. The only other problem involved with an impact detonating bomb is that it must strike a hard surface on the nipple to set it off. By attaching fins or a small parachute on the end of the bomb opposite the primer, the bomb, when thrown, should strike the ground on the primer, and explode. Of course, a bomb with mercury fulminate in each end will go off on impact regardless of which end it strikes on, but mercury fulminate is also likely to go off if the person carrying the bomb is bumped hard.
4.23 ELECTRICAL IGNITION
