How to make a bottle cannon

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I found a small section in a book about how to make bottle cannon's out of a glass bottle.
I thought I would post the intructions for adults/children to try it themselves!

You will need-

An empty glass bottle (preferably a champagne bottle)
1 cork to fit in the bottle
A piece of card
Blotting paper
2 pencils
Thread
Carbonate of soda
Tartaric acid
Water

Instructions-
1) Fill the bottle 1/3 of the way with water
2) Dissolve the carbonate of soda in the bottle
3) Make a cylinder out of the card and pour in the tartaric acid
4) Plug the other end of the cylinder with paper
5) Stick the pin into the base of the cork and tie it to the end of the cartridge with the thread
6) Make sure the bottom of the tube doesn't touch the water in the bottle when it's standing upright by ensuring that the thread is not too long
7) When you have made and attached the cartridge, lower it through the bottle neck and fit the cork into the bottle neck (not too tight)
8) FIRE AWAY!

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