The well-type manometer is illustration here, one column of which has a relatively small diameter; the second serves as a reservoir. The difference in cross-sectional area (sometimes as much as 1,500 times) ensures that while the level of the reservoir does not change appreciably with change of pressure, the level of the small diameter column does; this makes for adequate accuracy. Small adjustments to the position of the vertical scale, with the aid of the level indicator, compensate for the little reservoir change that does occur. Readings of differential pressure may then be made directly on the vertical scale. (A) Both columns are at atmospheric pressure, so the levels are the same. (B) The reservoir is pressurized. Its level is indicated so the scale may be adjusted to the new level.
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