On Tue, 20 Apr 2004 06:35:02 GMT, "Leo Lichtman"
vaguely proposed a theory
.......and in reply I say!:
remove ns from my header address to reply via email

Point taken. I was being cautious. It's hard to get sure that there is
no air in 15 metres of hose, though, by raising the ends up till there
are no folds G

Clear tubing is the safest. I saw a couple of mentions of garden hose.

Once this is done, there is no way for air to get in, and the system should
be accurate, no matter how you drag the hose, or whether it goes over bumps
or low spots.



************************************************** **
I went on a guided tour not long ago.The guide got
us lost. He was a non-compass mentor.........sorry
.........no I'm not.