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