>> So which is it?  Does one measure the difference in water levels from one
>> side of the "U" to the other after application of pressure?  Or does one
>> measure the total distance that the gas has lifted the liquid from a zero
>> point on one side of the "U"?

>It is the difference in the height of the 2 columns, not how high one column
>rises.
>You now have 22 inches of pressure in your gas lines, the way you did it.
>Does your fridge light and how about the flames on the stove?

Well thanks all for the science lesson.  Guess I had better perform that
pressure adjustment again!!!

I accept the decision but am still unclear as to the scientific
explanation as to why it is the difference in column heights rather than
the height difference in one column.  If anyone could educate me further
my enquiring mind would like to know.

Thanks,

Tony

Anthony L. Mourkas
Hampden, Maine, USA
1984 Vanagon Westfalia
1987 Vanagon Syncro GL
1991 Jetta Eco Diesel