Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Measuring Devices (hierarchy name)
5. measuring devices (instruments)
6. [measuring devices for phenomena]
7. meteorological measuring devices
8. [measuring devices for atmospheric pressure]
9. barometers

Anotations

Scope note:

Barometers of the type in which the column of liquid in the tube has above it a body of confined air or other gas (instead of a vacuum as in the mercurial barometer), so that the pressure of the atmosphere acts against the weight of the liquid and the elastic pressure of the gas; a thermometer is attached for correction of the readings according to the expansion or contraction of the gas with changes of temperature.