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iChapter 5 Measurement of Atmospheric Pressure CONTENTS 5.1 Definition and Units ······································································································ ····································· 1 5.1.1 Definition ··········································································································· ··················································1 5.1.2 Units ················································································································ ·····················································1 5.2 Principle of Atmospheric Pressure Measurement ········································································ ·············· 1 5.2.1 Mercury Barometer ······································································································· ····································1 (1) Principle of me rcury barometer ···························································································· ···················1 (2) Structure of the Fortin barometer·························································································· ···················2 (3) Handling precauti ons for me rcury··························································································· ················3 (4) Correction of ba rometer readings ·························································································· ··················3 (a) Corrections on index error ································································································ ··············3 (b) Corrections for temperature ······························································································· ·············3 (c) Corrections for gravity ··································································································· ·················4 5.2.2 Aneroid Instruments ····································································································· ·····································4 5.2.2.1 Aneroi d Barometer ····································································································· ·······································4 5.2.2.2 Aner oid Bar ograph ··································································································· ·········································5 5.2.3 Electroni c Barometer ···································································································· ·····································6 5.2.3.1 Cylindrical r esonator barometer ······················································································· ································6 5.2.3.2 Electrostatic capacity barometer ······················································································ ·································7 5.2.4 Reduction to Mean Sea Level ····························································································· ······························8 5.3 Maintenance ··············································································································· ······································· 10 5.3.1 Maintenance of the Mercury Barometer ················································································ ······················ 10 5.3.2 Aneroid Instruments ····································································································· ·································· 10 5.3.2.1 Aneroi d barometer ····································································································· ····································· 10 5.3.2.2 Aneroi d barogr aph ····································································································· ····································· 10 5.3.3 Electroni c Barometer ···································································································· ·································· 10 5.3.3.1 Cylindric al resonator ································································································· ····································· 10 5.3.3.2 Electrostatic capacity barometer ······················································································ ······························· 11 5.4 Calibration ··············································································································· ·········································· 11 5.4.1 Mercury Barometer ······································································································· ·································· 11 5.4.2 Aneroid Barometer ······································································································· ··································· 11 5.4.3 Electronic Barometer(Cylindrical resonator barometer, Electrostatic capacity barometer) ····················· 12 5.5 Repair ···················································································································· ·············································· 12 5.5.1 Mercury Barometer ······································································································· ································· 12
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