I recently came across the same article and it is very similar in theory to a lawnmower fuel guage. Mike Mims has it on his site at: http://www.fortunecity.com/marina/anchor/270/gauge.jpg
Seems just the trick, cheap, light and failsafe. Regards, Robin Wills RAAF Base Richmond Australia robinwi...@iprimus.com.au A KR Beats a C130 for fun anyday.
