Assertion: incandescent lamp | /r/CapableOf | act as the ballast
Facets:
value: for the germicidal lamp
type: PURPOSE
Source sentences:
text: The older lamps that resembled an incandescent lamp were often operated in series with an ordinary 40 W incandescent "appliance" lamp; the incandescent lamp acted as the ballast for the germicidal lamp.
text: Earlier[when?], household clothes dryers sometimes incorporated a germicidal lamp in series with an ordinary incandescent lamp; the incandescent lamp operated as the ballast for the germicidal lamp.