{HEAD ~ Batteries} 20 may be conveniently mounted in {TAIL ~ a spiral formed rod} 22 mounted on the framework of the apparatus 
{ HEAD ~ Batteries } 20 may be conveniently mounted in { TAIL ~ a spiral formed rod } 22 mounted on the framework of the apparatus
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH