Which wire is positive? - Page 3 - Fiberglass RV

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Old 07-25-2012, 09:43 PM   #29
Name: Rick
Trailer: 72 Boler
British Columbia
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Thomas - great idea for the nanometer. Question about using the water column device. When no pressure is applied the water level on both sides of the 'U' will be equal. Apply pressure and one side will rise while the other side drops. When measuring WC, is the measurement the difference between the two levels or just the amount of rise on one side?

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Old 07-26-2012, 04:39 AM   #30
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Originally Posted by RLP View Post
..........When measuring WC, is the measurement the difference between the two levels or just the amount of rise on one side?
The difference

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