Assertion: anode's voltage | /r/CapableOf | control larger current
Facets:
value: in a beam of cathode rays
type: LOCATION
value: much
type: DEGREE
Source sentences:
text: In 1906, Lee De Forest found that a small voltage on a grid of metal wires between the cathode and anode could control a much larger current in a beam of cathode rays passing through a vacuum tube.