OPINIONS OF INDUSTRY EXPERTS Pages 12.228, 12.229 and 12.230 are from an Engineering Master’s Thesis prepared by Cynthia Conway. After extensive research no data could be found on if the volume of a Bourdon tube changed on pressurization. We also did extensive research attempting to determine if the volume of a Bourdon tube changed on pressurization. The last attempt questioned the R & D divisions of gauge manufacturers who work with bourdon tubes. Of the many approached, four stated they have no data on the matter and two stated that the volume does not change. The net result left us concluding that it is an unknown fact. If it does change, the volume compensation characteristic will still allow the proof of Win ˂ Wout, if the volume change is less than the potential volume displacement of the entering shaft forced by the first Bourdon tube illustrated on page 12.217. 12.227
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