Thus, {HEAD ~ the voltage} dropped on {TAIL ~ each incandescent filament lamp} rises slowly and the incandescent filament lamps are safe 
dropped on
Thus , { HEAD ~ the voltage } dropped on { TAIL ~ each incandescent filament lamp } rises slowly and the incandescent filament lamps are safe
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH