| http://www.w3.org/ns/prov#value | - When it is desired to determine the zero pressure reading of the recorder 26, a fluid, preferably a gas such as air or carbon dioxide is passed down the flexible tube 19 via valved line 27 connected toa fluid container 28 to raise the pressure inside the balloon and distend it until it is no longer in contract with the tube 10 at least along prong 24.
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