Variometer is a technical term for a Vertical Speed Indicator (VSI), usually referring to an instantaneous VSI. These are most commonly installed in sailplanes, where their sensitivity is important for detecting the small vertical air currents that a sailplane requires to remain aloft.
Va`ri*om"e*ter (?), n. [L. varius various + -meter.] (Elec.)
An instrument for comparing magnetic forces, esp. in the earth's magnetic field.
© Webster 1913
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