# the refractor-ray screen that protects [[Galt's Gulch]] from detection from the air above it.
# the refractor-ray screen that protects [[Galt's Gulch]] from detection from the air above it.
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The [[Atlas Shrugged, Part 1|film adaptation]] (see below) replaces the electrostatic motor with a [[John Galt#The quantum motor|quantum motor]], that uses electrostatic effects that typically operate in a ''quantum vacuum.''