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Answer for the clue "A measuring instrument for measuring variations in a magnetic field ", 10 letters:
variometer

Word definitions for variometer in dictionaries

Wiktionary Word definitions in Wiktionary
n. 1 An instrument used to measure variations in a magnetic field. 2 A rate-of-climb indicator.

WordNet Word definitions in WordNet
n. a measuring instrument for measuring variations in a magnetic field

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Variometer \Va`ri*om"e*ter\, n. [L. varius various + -meter.] (Elec.) An instrument for comparing magnetic forces, esp. in the earth's magnetic field.

Wikipedia Word definitions in Wikipedia
A variometer – also known as a rate of climb and descent indicator ( RCDI ), rate-of-climb indicator , vertical speed indicator ( VSI ), or vertical velocity indicator ( VVI ) – is one of the flight instruments in an aircraft used to inform the pilot of ...

Usage examples of variometer.

Joya showed me the small instrument panel and explained it to me: variometer for rate of ascent and descent, pyrometer for temperature up in the crown of the balloon, compass-which she said was not very meaningful because there was no way to steer once you were aloft.

As the men were hooking the load cables to the tie blocks, Joya showed me the small instrument panel and explained it to me: variometer for rate of ascent and descent, pyrometer for temperature up in the crown of the balloon, compass-which she said was not very meaningful because there was no way to steer once you were aloft.

Readings from altimeter, variometer, airspeed indicator, attitude indicator--those were real.