Uh! com-n Vance....
A sight gauge is simply a "window" or "windows"

that are

cut on the side of liquid holding containers for

level

viewing and as long as they "share" the same

ambient

venting they will read identical levels. Otherwise

it

becomes a manometer.

This is why the basic physics LAW..."Fluids will

seek

their own levels". Anybody care to argue with the

laws

of physics"?
                                 Butch Diaz Sr.

Butch - Nothing that I have said violates or even
strtetches the laws of physics (incidently that really
is not one of them tho the effects are the same)
Vance

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