Measuring Tire Air Pressure
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The copper-colored tube is the Bourdon tube. On the lower left, it is clear to see that the open end of the tube is soldered to the brass inlet port for the gauge. When charged with air, the tube tries to straighten out, moving the white gear and driving the brass pinion gear attached to the needle on the face of the gauge-the part we look at to get our reading. View Related Article
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