Bible Dictionaries
Crookes Space
Webster's Dictionary
The dark space within the negative-pole glow at the cathode of a vacuum tube, observed only when the pressure is low enough to give a striated discharge; - called also Crookes layer.
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Bibliography Information
Webster, Noah. Entry for 'Crookes Space'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/c/crookes-space.html. 1828.