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fiducial point


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1 Temperature at which the atmospheric-pressure scale of a particular barometer reads correctly. The temperature at which this is so in latitude 45° is called the standard temperature of that barometer. At other temperatures and other latitudes, corrections must be applied.

2 Fixed point (indicated by a pointer) that is the zero of the scale of a Fortin barometer.

Subjects: Ecology and Conservation — Earth Sciences and Geography.


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