Gravity flexes the opposite end of the beam or wire into {HEAD ~ contact} with {TAIL ~ the tubular case}, creating a closed electrical circuit 
with
Gravity flexes the opposite end of the beam or wire into { HEAD ~ contact } with { TAIL ~ the tubular case } , creating a closed electrical circuit
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH