BS 2520:1983
Withdrawn
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Specification for barometer conventions and tables, their application and use
Hardcopy , PDF
02-08-2013
English
31-08-1983
Foreword
Committees responsible
Section one. General and barometric conventions
1. Scope
2. Pressure units
3. Conditions of mercury barometers
3.1 Standard conditions for general-purpose mercury
barometers
3.2 Non-standard conditions for special-purpose
mercury barometers
4. Application of conventions
Section two. Barometer tables
5. Categories of barometer covered
5.1 General
5.2 Fortin category
5.3 Kew category
6. Purpose and basis of tables
6.1 General
6.2 Interconversion of barometer pressure units
6.3 Correction of barometer readings to standard
conditions
6.3.1 General
6.3.2 Correction to 0 deg C
6.3.3 Correction to standard gravity of 9.806 65 m/s(2)
6.4 Conversion of pressure reading from barometer
level to another level
Appendices
A. Examples of the correction of barometer readings
A.1 Barometer measuring ambient pressure
A.2 Barometer measuring artificial pressure
A.3 Use of the tables to obtain the readings of
a mercury barometer used in an airtight system
at an ICAO pressure corresponding to a given
altitude
B. History and advantages of the conventions
C. Testing of barometers
D. Information regarding the conventions
D.1 Relationships connecting the pressure units
D.2 Relationships connecting scales
D.3 Change from pre-1954 conventions to present
standard conventions
Tables
Interconversion of barometric pressure units
1. Kilopascals and hectopascals (millibars) to
millimetres of mercury and inches of mercury
2. Millimetres of mercury to kilopascals, hectopascals
(millibars) and inches of mercury
3. Inches of mercury to kilopascals, hectopascals
(millibars) and millimetres of mercury
Correction of barometer readings to standard temperature
(0 deg C)
4. Hectopascal (millibar) and millimetre-of-mercury
Fortin barometers. Long-range table
5. Hectopascal (millibar) and millimetre-of-mercury
Fortin barometers. Short-range table
6. Inch-of-mercury Fortin barometers. Long-range table
7. Inch-of-mercury Fortin barometers. Short-range table
8. Hectopascal (millibar) Kew barometers (MO pattern)
9. Millimetre-of-mercury Kew barometers (MO pattern)
10. Inch-of-mercury Kew barometers (MO pattern
11. Kew barometers for which V/A = 100 mm: correction
additional to the Fortin correction
Correction of barometer readings to standard gravity
(9.806 65 m/s(2)) for latitude variation
12. All hectopascal (millibar) and millimetre-of-mercury
barometers. Long-range table
13. All hectopascal (millibar) and millimetre-of-mercury
barometers. Short-range table
14. All inch-of-mercury barometers. Long-range table
15. All inch-of-mercury barometers. Short-range table
Correction of mercury barometer readings to standard
gravity (9.806 65 m/s(2)) for altitude variation
16. Correction for height, in metres, above mean sea
level
17. Correction for height, in feet, above mean sea level
Conversion of pressure reading from barometer level to
another level
18. All mercury barometers. Pressure difference per
metre and per foot of vertical distance between
barometer cistern and level in same building at
which the pressure is required
Pressure units
19. Conversion factors for pressure units
20. Difference in scale reading caused by change from
obsolete to present conventions
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