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Rubber Balloons: Two Circles of Natural Rubber Sheet Pressed Together at the Edge
Michael Faraday made the first rubber balloon in 1824, and by 1825 Thomas Hancock sold them as two rubber circles to be joined by pressing their edges together. Cut two circles with a neck tab from thin natural rubber sheet, dust the inner faces, and press the fresh-cut edges hard together.
The picture: our diagram, two circles joined into a balloon.
Beginner
Half an hour
Instructions
1
1
Cut the circles
Cut the circles
Draw a paper circle with a short neck tab, lay it on thin rubber sheet and cut two matching pieces.
Materials for this step:
Natural Rubber Sheet0.05 m2Tools needed:
Paper
Pencil
Scissors2
2
Dust the insides
Dust the insides
Dust the inner face of each piece lightly with talc, keeping it off the outer edge.
Tools needed:
Talcum Powder3
3
Join the edges
Join the edges
Lay the two pieces together and press and rub the fresh-cut edges hard all round, leaving the neck open.
Tools needed:
Scissors4
4
Test
Test
Blow gently into the neck and listen for leaks; press any leaking edge again.
Tools needed:
Talcum Powder5
5
Circle size
Circle size
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Materials
1- 0.05 m2Placeholder
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