Half a croissant, on a plate, with a sign in front of it saying '50c'
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This would work fine, except in terms of success.

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Pump Error Warning Clock

It's says 3:45pm! Poor little fish!
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[inspired by swimr's idea]

The pumps in fish tanks act to oxygenate the waters to ensure that your fish don't expire, but if you're one that doesn't constantly watch your fish tank, it's difficult to know whether the pump has been working all day to keep the waters fresh.

The pump error warning clock will help you.

As the pump works, little air bubbles rise through the water - the clock is placed just above the pump with it's face pointing outwards displaying the time.

As the bubble rises, it hits the paddle of a small 'watermill wheel' within the clock mechanism. This turns the wheel and drives the clock.

The fish owner sets the clock to the right time and places it back onto the pump in the tank. If the pump has worked properly all day, the clock will show the right time on your return.

It's says 3:45pm! Poor little fish!

jonthegeologist, May 25 2004

[swimr]'s idea. http://www.halfbake...Fish_20Tank_20Clock
[jonthegeologist, Oct 05 2004, last modified Oct 17 2004]

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       A warning light or buzzer indicating pump failure would be much simpler, but that's really not the point is it?
angel, May 25 2004
  

       You'd need some kind of alarm to warn you. Otherwise you'd just find out the time of death of your fish and not be able to help...
hazel, May 25 2004
  

       [hazel] - fit the alarm clock option.
jonthegeologist, May 25 2004
  

       surely an SMS or bluetooth or email option, for when the backup pump kicks in.
neilp, May 25 2004
  
      
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