The water and flower power clock
We've still not found anyone who can tell us how this £10 water-powered alarm clock works, though work it does. You stick a tiny bit of H2O in the right-hand tube and it flickers to life a couple of minutes later; the left-hand tube's just for symmetry and makes a rather nice mini vase. The only thing that's dubious is that - according to the manual - it'll only last two years. So, what's greener - a water-powered plastic alarm you replace every two years or a mains-powered job you keep forever? Answers on a comment form, please. (There's also a water-powered calculator at the bottom of the page here)
The clock battery features two alloys of a patented formulation, one positive and the other negative, which when immersed in water are able to generate electricity.
The battery can be replaced when it has run out, indicated by dimming of the display, and costs about £4-5.
Posted by: Simon Steenson | 31 Oct 2006 15:24:58
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