Jumping cracker
From PyroGuide
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Jumping crackers or Jumping jacks are a type of firecracker. When lit each segment loudly pops (or bangs, depending on how much paper is used) and has a nasty habit to unpredictably jump around, (hence the name) changing direction with each bang. They were a common firework available in assortments in the 1930's from such companies as Brocks. They were subsequently banned for their unpredictable nature. [edit] MaterialsKraft paper You will need some kraft paper around 30-50 lbs in thickness. Propellant Meal powder, a few percents of dextrin can be added, however not necessary. Other Fuse, preferably visco fuse, but black match or touchpaper can substitute. Also a paint brush, water, glue, and string is needed. [edit] Method |
 A jumping cracker is made of a craft paper strip roughly 6 cm by 25cm. It is also possible to use a longer strip, this will result in more cracks (or "jumps"). First a line of wet meal powder is applied with a small paint brush along the longer edge of the strip of kraft paper, which is then wound several times and glued. |
 It looks much like quick match tube. One end is then bent, thus making an end chamber. |
 The tube is now zig-zagged as many times as the length allows and a piece of fuse stuck into the opposite open end. |
 A piece of twine or string is then tightly wound around the center and criss-crossed around each segment of the snake-looking device. It is then left to dry for a day or more. When lit, each segment loudly pops (or bangs, depending on how much paper is used) and has a nasty habit to unpredictably jump around (hence the name) changing direction with each bang. [edit] References
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