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