It is the gearing, becasue the gears amplify the movement of the bourdon tube into a much larger movement of the needle on the dial. the gears are a mechanical amplifier.
· Friction· Wear· And backlash in gears.
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Bourdon gauge
Eugene Bourdon invented and patented the Bourdon tube pressure gauge.
Bourdon's tube pressure gauge cannot be used to measure negative pressure. This is because absolute pressure must be measured and the Bourdon gauge only indicates the gauge pressure.
Pressure.
Bourdon gauge is a type of aneroid pressure gauge consisting of a flattened curved tube attached to a pointer that moves around a dial. As the pressure in the tube increases, the tube tends to straighten and the pointer indicates the applied pressure.
A Bourdon Tube or a Bellows gauge
A bourdon gauge is a type of aneroid gauge. It is used to measure pressure.
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· Friction· Wear· And backlash in gears.
Adjust by link, sector & pinion
In 1849, the Bourdon tube pressure gauge was patented in France by Eugene Bourdon.
------------>[bourdon tube]--------->[level & gear]---------->[pointer,scales]-------> pressure small amplified pressure displacement displacement