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The word aneroid means literally no air, in reference to a box that is evacutated and has no air in it, which is the central part of an aneroid barometer. As air pressure increases, the evacuated box will be deformed by it.

Calibrating a barometer,( for"swing") requires a hyperbaric chamber, a pressure source,(eg compressor), a set of accurate "Standards" gauges, a vacuum pump, and a pressure regulator. You take readings at various pressure points, then compare your readings obtained against your standards gauges. The internal mechanism is adjustable by varying the pivot point geometry, and also by resetting"set off point" via the vertical metal link strip, which has multiple holes.

For most intents, setting an aneroid accurately by taking it to an NOAA Meteorolgy office is acceptable. Simply take it in, then adjust yours to the office's standard, either to read"true" or you can set it to read "corrected for altitude" ,(the number given on websites, or news forcasts, which IS NOT the TRUE barometric pressure)barometric pressure via adjustment screw in back. This does not tell you if it will remain accurate at points above or below the set area as the needle swings due to pressure changes.

Regards,

Merrill

metricmerrill@bresnan.net

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