h a l f b a k e r yNaturally, seismology provides the answer.
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This idea places a small bell with a ferrous clapper at the top of a zipper; adjacent is a small rare-earth magnet. When the zipper is up and closed, the bell is silenced. When the zipper is down, the bell is free to ring when activated by the user's motion. This should be a very resilient device able
to withstand washing and dry cleaning.
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[+] Make sure the magnet doesn't lose its properties in a hot wash. |
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[+], provided the potential for embarrasment ('I'm sorry, sir! My pants appear to be magnetically attracted to your own!') can be engineered out. |
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"Product warning: Do not wear trousers in the vicinity of MRI scanners or severe groinal injury may occur" |
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Also a convenient place to hold your grocery list.
But wouldn't the clothing attenuate the bell? |
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