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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.
初学者
Half an hour
说明
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.
此步骤所需材料：
天然橡胶板0.05 m2所需工具：
纸
铅笔
剪刀2
2
Dust the insides
Dust the insides
Dust the inner face of each piece lightly with talc, keeping it off the outer edge.
所需工具：
滑石粉3
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.
所需工具：
剪刀4
4
Test
Test
Blow gently into the neck and listen for leaks; press any leaking edge again.
所需工具：
滑石粉5
5
Circle size
Circle size
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