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school timer

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linus20 | 18:53 Mon 30th Sep 2002 | Technology
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school project,draw and make device that can time 30 seconds,any ideas please
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Avatar Image lisaj
pendulum and ratchet
20:24 Mon 30th Sep 2002
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get two cardboard boxes. Stick their bottoms together. Make small hole. Put sand in and time how long it takes sand to fall from top to bottom. Add or remove sand till it takes 30 secs.

 

Try same with empty plastic drink bottles and use water.

 

21:09 Mon 30th Sep 2002

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