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Magnetic envelope

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Magnetic envelope, sine wave

A magnetic envelope (left) and a sine wave before and after

A magnetic envelope was an object whose sine wave could be measured.

In 2286, a memory test Spock was taking asked him to "adjust the sine wave of this magnetic envelope so that anti-neutrons can pass through it but anti-gravitons cannot". He did so correctly. (Star Trek IV: The Voyage Home)

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