Assertion: tube's anode | /r/HasProperty | generated by an induction coil
Facets:
value: usually
type: TEMPORAL
value: for larger tubes
type: PURPOSE
Source sentences:
text: To operate, a DC voltage of a few kilovolts to as much as 100 kV was applied between the anodes and the cathode, usually generated by an induction coil, or for larger tubes, an electrostatic machine.