SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Bourdon gauge manometer. A flattened, closed-ended tube is bent into a C-shape. The open end is connected to a fixed pipe connected to the fluid whose pressure is to be measured. As pressure increases, the tube tends to try to straighten, this tiny movement is magnified by a gear system into the rotation of a pointer on a dial. This gives a gauge pressure (relative to atmospheric).
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