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Improvised Gas Mask

Step 8Seal the Joint Between Can and Tube

Seal the Joint Between Can and Tube
Wrap the end of the can and the joint with the tube with plastic cling-wrap and tape.
Try sucking air through the tube while the open end of the can is blocked. It shouldn't be possible.
It's very much easier to seal vacuum leaks than pressure leaks. Vacuum leaks tend to suck things into them and seal themselves.
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Author:TimAnderson
Tim Anderson is the author of the "Heirloom Technology" column in Make Magazine. He is co-founder of www.zcorp.com, manufacturers of "3D Printer" output devices. His detailed drawings of traditional ...
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