As will be seen, the two arms 30 and 38 permit {HEAD ~ movement} in five of the degrees of {TAIL ~ freedom}, linear along the Z and X axes and rotation about the X, Y and Z axes 
As will be seen , the two arms 30 and 38 permit { HEAD ~ movement } in five of the degrees of { TAIL ~ freedom } , linear along the Z and X axes and rotation about the X , Y and Z axes
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH