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