The carriage 3 is also provided with a pointer 16 which extends in {HEAD ~ a direction} generally parallel to {TAIL ~ the wire} 1 
The carriage 3 is also provided with a pointer 16 which extends in { HEAD ~ a direction } generally parallel to { TAIL ~ the wire } 1
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH