Assertion: glass tube | /r/HasProperty | evacuated of air
Facets:
value: partially
type: DEGREE
Source sentences:
text: In 1838, Michael Faraday applied a high voltage between two metal electrodes at either end of a glass tube that had been partially evacuated of air, and noticed a strange light arc with its beginning at the cathode (positive electrode) and its end at the anode (negative electrode).