Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
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)